The Sigma 50mm f1.4 DG HSM Art is a standard prime lens from 2014 designed for full-frame bodies and available in Nikon F, Canon EF, Sony E and Sigma mounts, with a Leica L-mount version arriving later in 2019. A 50mm lens delivers ‘normal’ coverage on a full-frame body and is ideal for general-purpose use, and becomes equivalent to 75mm on APS-C/DX camera bodies (80mm on Canon), making it ideal as a short telephoto for portraiture. Its bright f1.4 focal ratio is good for isolating the subject against a blurred background and is brighter by 2/3 of a stop than f1.8 lenses which allows for better background isolation and shorter shutter speeds and/or lower ISO values. The Sigma 50mm f1.4 Art is also compatible with Sigma’s USB dock for fine-tuning or firmware updates, and if you change bodies, you can pay to have the mount swapped for your new system.
As a member of Sigma’s renown Art series the Sigma 50mm f1.4 Art is expected to perform on a very high level. It is positioned roughly between standard 50mm f1.4 lenses and the top-end models from Canon, Nikon, and Sony in price. The big question then is how does it to compare to those below and above it in price? Does it offer a sufficient step-up from normal 50mm f1.4 lenses to justify the price, and does it give the pricier models a run for their money? To find out, Thomas and Gordon teamed-up to give the Sigma 50mm Art a real workout and compared it against a whole slew of other lenses including the Zeiss Otus 55mm f1.4, Canon EF 50mm f1.2L USM, and Sony FE 50mm f1.4 ZA. We’ve completely updated our original review from 2014 with test-shots on the 46MP Nikon Z7 and the 42MP Sony A7R II. So if you’re interested in which high performance standard prime lens to choose for your camera system, you’ve come to the right place!
Facts from the catalog
As usual I’ll have a look at the technical data of the Sigma 50mm f1.4 Art first. I’ve rated the features with a [+] (or [++]), when it’s better than average or even state of the art, a  if it’s standard or just average, and [-] if there’s a disadvantage. For comparison I use the Sony FE 50mm f1.4 ZA, Nikon Z 50mm f1.8 S, Nikon AF-S 50mm f1.4G, Zeiss Otus 55mm f1.4, and Canon EF 50mm f1.4 USM and simply dub them “Sigma”, “Sony”, “Z-Nikkor”, “F-Nikkor”, “Canon”, and “Zeiss” to make the comparison easier to read.
Size (diameter x length): The Sigma is a big and long lens at 85 x 98mm (3.3 x 3.9in.) for F-mount plus 47mm for the lens hood (96mm diameter). The F-Nikkor (73 x 54mm + 32mm) and Canon (74 x 51mm) are small in comparison. The Zeiss is the biggest lens (92 x 117mm + 32mm lens hood). Adding the necessary adapter to mount the Sigma, Zeiss, F-Nikkor, and Canon on a modern mirrorless camera body makes those lenses even longer by around 30mm. Of the lenses already designed for mirrorless bodies the Sony is also quite large at 83 x 108 + 53mm lens hood while the Z-Nikkor at 76 x 87mm + 40mm lens hood is of medium size. [-]
Weight: The Sigma is a pretty heavy lens at 805g (28.4oz.) plus 43g for the lens hood only topped by the Zeiss at 945g + 64g lens hood. The Canon and the F-Nikkor are the lightest of the bunch at below 300g. The Z-Nikkor with its focal ratio of f1.8 is somewhat in between at 412g + 27g lens hood. The Sony is 780g + 33g lens hood. Keep in mind though that if you want to use the Sigma, Zeiss, Canon or F-Nikkor on a mirrorless body you need an adapter which weighs another 100 to 130g or in case of the Sigma get the respective mirrorless version which weighs 910g. [-]
Optics: All the modern designs since 2013 are pretty complex at 12 to 13 elements in 8 to 10 groups and employ aspherical elements. Only the F-Nikkor (8 elements in 7 groups) and the Canon (7/6) are much simpler designs but even the Canon employs an aspherical element. [+]
Closest focus distance of the Sigma is 0.38m (1.2ft.) in manual focus with a magnification of 1:5.4. The Z-Nikkor yields 1:6.0 at the same distance while the others offer a maximum magnification of around 1:6.5 at 0.45 to 0.5m distance. The Sigma achieves a magnification of 1:10 at 0.61m distance. 
Filter-thread: Sigma and Zeiss 77mm, Sony 72mm, Z-Nikkor 62mm, F-Nikkor and Canon 58mm. [+]
Image stabilization: No lens in this comparison has an optical stabilization. But the modern mirrorless bodies from Sony and Nikon provide built-in sensor-shift stabilization. 
Auto focus: all the lenses in this comparison except for the Zeiss have a built-in AF drive. Manual-focus override is by simply turning the focus ring. The Sigma, Zeiss, Canon and F-Nikkor have a direct linear mechanical coupling between the focus ring and the focus action. They also offer the distance and dof markings that normally come with lenses designed for DSLRs. The focus ring on the lenses designed for mirrorless camera bodies operate as focus-by-wire with no distance or dof markings. The Sony has a linear gearing while the Z-Nikkor has non-linear gearing which makes smooth focus pulling almost impossible for videographers. [+]
Covers full frame/FX or smaller. Same with the alternatives. [+]
Price: The Sigma (690 EUR / 950 USD) is more expensive than the 50mm f1.4 lenses from Nikon (410 EUR/USD) and Canon (300 EUR / 350 USD w/o lens hood) or the Z-Nikkor (360 EUR / 600 USD). But the Sigma is comfortably cheaper than the Sony (1500 EUR/USD) and especially the Zeiss (3200 EUR / 3600 USD). 
The Sigma and the Sony come equipped with a nice padded pouch, the Nikkors have flimsier pouches and the Zeiss and Canon come without a pouch at all. All lenses also have their lens hood included (reversible for transport) except for the Canon where you have to buy the lens hood as an extra – which I would recommend to do. [+]
Sigma’s service can change the mount of the lens between Nikon, Canon, Sony, Sigma, and L-mount (at a cost). This is a unique feature that no other manufacturer offers. [++]
Aperture ring: Only the Sony and the Zeiss have an aperture ring. The Sony with 1/3 stop clicks which can be turned off for continuous, smooth, and noise-free operation. The Zeiss offers only 1/2 stop clicks which cannot be turned off. 
Sealing: The Sigma has no weather sealing which is a shame considering its premium status. The Sony and the Z-Nikkor have special weather-sealing throughout the construction but the Sony lacks a rubber sealing at the lens-mount. 
The score in the “features-department” is 2[-]/5/7[+]. On paper only the large size and weight is on the negative side, although for the money some weather sealing would have been nice. On the positive side is the unique option to get the lens-mount swapped.
There’s no shortage of 50mm lenses on the market, and many camera and lens companies actually offer a choice of apertures too. The f1.8 versions are definitely worth considering: they are smaller, lighter, cheaper, less obtrusive and often deliver similar – or even superior – image quality than their bigger brothers. The loss of 2/3 of a stop may not be as relevant as the marketing literature wants you to believe. But if you absolutely want or need f1.4 (or brighter) then you have the following alternatives with autofocus:
- Canon offers the EF 50mm f1.4 USM at 300 EUR / 350 USD or the EF 50mm f1.2L USM at 1350 EUR/USD. See Gordon’s Canon EF 50mm f1.2L USM review. Full-frame Canon mirrorless owners can alternatively go for the native RF 50mm f1.2L at a considerable 2300 USD; see Gordon’s Canon RF 50mm f1.2L USM review.
- Nikon has the AF-S 50mm f1.4G (410 EUR/USD) and the AF-S 58mm f1.4G (1600 EUR/USD). See my Nikon 50mm f1.4G review and my Nikon 58mm f1.4G review.
- Sony offers the FE 50mm f1.4 ZA for 1500 EUR/USD. See my Sony FE 50mm f1.4 ZA review.
- Samyang has the AF 50mm 1.4 FE for Sony E-mount only from 2016 which sells for 480 EUR/USD.
- Leica L-mount owners have the Panasonic offers the Lumix S PRO 50mm f1.4 for 2300 USD or the Leica Summilux SL 50mm f1.4 for 5300 USD, making the arrival of the Sigma a very welcome ‘budget’ option.
Other alternatives include manual focus lenses or lenses with slower focal ratios or shorter focal length:
- Sigma has their 40mm f1.4 Art for 1200 EUR / 1400 USD. The lens is huge and heavy but optically excellent. See my Sigma 40mm f1.4 Art review where it earned a Highly Recommended. With its shorter focal length you have to crop 25% to achieve the same angle of view as a 50mm lens which reduces the resolution of a 46MP full-frame image to 29MP.
- Sony offers the FE 55mm f1.8 ZA for 830 EUR / 1000 USD. It is a much smaller and lighter lens than its bigger sibling but you lose 2/3 of a stop of light gathering power and suffer some reduction in background isolation. I’ll be soon completing my Sony FE 55mm f1.8 ZA review. There’s also the budget but basic FE 50mm f1.8 to consider.
- Nikon has come out with a new standard lens for their mirrorless system, the Z 50mm f1.8 S costing 360 EUR / 600 USD. See my Nikon Z 50mm f1.8S review.
- Samyang has several manual focus 50mm lenses one of which is the 50mm 1.4 AS UMC which sells for around 350 EUR/USD.
- The 800 pound gorilla in the group of MF lenses is the Zeiss Otus 55mm f1.4, and I wish it cost 800 pounds! At a price of 3200 EUR / 3600 USD and over 900g weight plus a completely different optical design than other “normal” lenses it set a new benchmark in 2013 on optical performance in this group. See my Zeiss Otus 55mm f1.4 review where it earned a Highly Recommended. Zeiss also offers the manual focus Loxia 50mm f2 and the autofocus Batis 40mm f2.
Focus accuracy and repeatability is critical to consistently produce sharp shots especially with large aperture lenses. Repeatability (the accuracy of focus on the same subject after repeated focus-acquisition) of the Sigma 50mm f1.4 Art is good (measured 97.7% in Reikan FoCal) with no outliers over a series of 40 shots. There is only a very slight focus variation whether the lens focuses from a closer distance or from infinity.
The lens focuses in around 0.7 sec on a Nikon Z7 from infinity to 0.61m (1:10 magnification), which is not bad. On a Nikon D800 it focused even faster in 0.6 sec. The Sony and the F-Nikkor move in around 0.9 resp. 0.8 sec. Only the Z-Nikkor is faster at 0.5 sec. The focus ring has no slack/play between its movement and the focus-action and a throw of around 90 degrees, which is very short for accurate focus wide open. The focus ring has a 2.5 cm wide finely ribbed rubber surface that is easy to grip and moves smoothly albeit a bit tight. The other lenses have a smoother AF operation. The focus-ring turns the same way as on Canon and Sony lenses. Unfortunately that is the opposite direction to what Nikon users have come to expect.
If you record video with the built-in microphone the focus-movement produces only a slight “clack” at the start and the end of the movement and the AF-drive itself is also not too annoying. The F-Nikkor has a more irritating focus noise while focus-operation of the Zeiss, Sony and Z-Nikkor is inaudible from the outside and if you record video with the built-in microphone. As you pull focus, you’ll notice some focus breathing: the image of the Sigma 50mm f1.4 Art becomes 7% more magnified when I adjusted the focus from infinity to 0.61m. This could be distracting when shooting videos but is par for the course: most other lenses in this comparison increase their magnification between 5% and 7% except for the Z-Nikkor which shows almost no focus breathing (-0.7%).
The lens needed some AF micro adjustment for optimal AF on my D800 depending on the distance from the subject. Fortunately the lens can be adjusted for four different distance ranges (around 40cm, 70cm, 1.5m and infinity) if you get Sigma’s USB dock and use their optimization pro software. But beware: this is a pretty tedious process. If you only use the AF micro adjustment in your camera then go for the adjustment which best matches your typical shooting distance with this lens.
Next check out my quality results!Check prices on the Sigma 50mm f1.4 Art at Amazon, B&H, Adorama, or Wex. Alternatively get yourself a copy of my In Camera book or treat me to a coffee! Thanks!