The Sigma 85mm f1.4 DG DN Art is a mild telephoto lens designed for full-frame mirrorless cameras with E-mount and L-mount. Its focal length and bright f1.4 focal ratio make it ideal for portraits but also useful for street photography or picking-out details in urban or natural landscapes. Announced in August 2020, it’s only the second large aperture prime lens after the 35mm f1.2 DG DN Art in Sigma’s ART line which was specifically designed for mirrorless cameras (denoted by the “DN” moniker). These primes are complemented by two zoom lenses: the 14-24mm f2.8 DG DN Art and 24-70mm f2.8 DG DN Art.
As optical designs for mirrorless cameras with their shorter flange distance have to cope with fewer restrictions it is interesting to see what lens manufacturers make of this new freedom. In case of their 85mm f1.4 design Sigma obviously opted for small and light which is good as the old DSLR design from 2016, the 85mm f1.4 DG HSM Art, was a huge beast of a lens at 152mm (6.0 in.) length and 1.25kg (2.8lb.) weight (for Sony E-mount). The new DG DN is only 96mm (3.8 in.) long and weighs 625g (1.4lb.) – a huge difference! This makes the new lens even 11mm shorter and 200g lighter than the Sony FE 85mm f1.4 GM. Sigma also added a de-clickable aperture ring which makes it great for video work. And the lens has an additional button which can be assigned AF-lock or other functions.
The Sigma 85mm f1.4 DG DN Art is listed at 1099 EUR (incl. 16% VAT) / 1199 USD / 999 GBP. In my review I’ve compared the new lens with its DSLR sibling and the Sony FE 85mm f1.4 GM to find out which one is the best 85mm f1.4 lens. PS – if you’re interested in the other Sigma DG DN Art lenses mentioned above check out our in-depth reviews: Sigma 35mm f1.2 DG DN Art review, Sigma 24-70mm f2.8 DG DN Art review. There’s also lots of sample images in the Sigma 12-24mm f2.8 DG DN Art review-so-far.
Facts from the catalog
Let’s compare the Sigma 85mm f1.4 DG DN Art to the Sigma 85mm f1.4 DG HSM Art (“Sigma HSM” for short) and the Sony FE 85mm f1.4 GM (“Sony”). As usual 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.
Size (diameter x length): 84 x 96mm (3.3 x 3.8in.) plus 49mm for the lens hood which is 102mm in diameter. The Sony is 90 x 108mm (3.5 x 4.3in.) + 42mm lens hood. The Sigma HSM is much longer at 95 x 152mm + 53mm lens hood. Have a look at the differences in size below where both Sigma lenses are displayed at an identical scale. [+]
Weight: 625g (22 oz.) plus 71g for the lens hood. The Sony is 820g (28.9 oz.) + 55g lens hood. The Sigma HSM is much heavier at 1245g (43.9 oz.) + 51g lens hood. [+]
Optics: The Sigma 85mm f1.4 DG DN Art is a pretty complex design with 15 elements in 11 groups including 5 special dispersion elements and 1 aspherical element. This is similar to the Sigma HSM. The Sony is less complex with 11 elements (including 3 special dispersion elements and one aspherical element) in 8 groups. [+]
Closest focus distance is 0.77m (2.5ft.) with a magnification of 1:7.0 which is quite meagre. This results in a working distance of 0.66m. The Sony and the Sigma HSM have slightly less magnification. A magnification of 1:10 is achieved at 1.02m (3.3ft.) distance which is similar to the other two lenses. 
Filter-thread: 77mm, the professional standard. Same with the Sony. The Sigma HSM needs more expensive 86mm filters. [+]
Image stabilization: No optical stabilization of the lens. The Sony A7 or Panasonic DC-S1 camera bodies provide built-in sensor-shift stabilization. Same with the other two lenses. 
Auto focus: Built-in AF drive with stepping motor. Manual-focus override is by simply turning the focus ring. The focus ring has a variable gearing which allows for very precise manual focus when turned slowly but cannot be switched to linear gearing for smooth focus pulling. There’s a customizable focus-lock button AFL on the barrel but no distance markings. The Sony also has variable gearing and a focus-lock button. Focus on the Sigma HSM works differently as is usual for lenses designed for DSLRs: It has a direct linear coupling between the focus ring and the focus action and offers a display for focus distance and depth of field but no focus-lock button. [+]
Lens profile: The lens comes with a lens profile for vignette-, CA- and distortion-compensation which can be controlled from the camera. Adobe’s RAW converter (as of version 12.4) does not recognize the profile completely: vignette is compensated as it was set in camera (but you cannot switch between off and auto in post-processing) while CA-compensation is always ON, distortion compensation always OFF. To get rid of the distortions in RAW files you have to activate manual correction. [+]
Covers full frame or smaller. Same with the other two lenses. [+]
Price: 1099 EUR (incl. 16% VAT) / 1199 USD / 999 GBP. The Sigma 85mm f1.4 DG HSM Art currently goes for 1070 EUR / 1100 USD / 930 GBP and the Sony FE 85mm f1.4 GM is at 1600 EUR / 1800 USD / 1500 GBP. [+]
The Sigma 85mm f1.4 DG DN Art has a nicely padded lens case, the lens hood is included, reversible for transport, and has a lock to prevent it from accidentally falling off. The Sony also comes with a pouch and a lockable lens hood. The front-end of Sony’s lens hood is rubberized which prevents dinks from setting the lens down on the hood and also provides more grip on smooth surfaces. Same with the Sigma HSM except the lens hood has no lock and no rubber font-end. [+]
Sigma’s service can change the mount of the lens between Sony’s E-mount and L-mount (at a cost). This is a unique feature that no other manufacturer offers. [++]
Aperture ring: yes with 1/3 stop clicks. The lens has a switch to turn the clicks of so that the aperture can be operated continuously, smoothly, and noise-free. It also comes with a dedicated lock switch to prevent accidental shifting between aperture control from the ring or the camera. Same with the Sony except for the aperture lock. The Sigma HSM has no aperture ring. [+]
Sealing: yes, a rubber grommet at the lens-mount plus further special weather-sealing throughout the construction, just like the Sony and Sigma HSM. [+]
The score of 0[-]/2/13[+] shows that the Sigma 85mm f1.4 DG DN Art is very well-featured with its small size and weight and the unique option to get the lens-mount swapped. There’s hardly anything to complain about – on paper.
Above from left to right: Nikon Z 85mm f1.8 Z, Sigma 85mm f1.4 DG DN Art, Zeiss Otus 85mm f1.4 ZF.2
As a large aperture 85mm lens is the most sought-after portrait lens for full-frame cameras there is a broad supply of them. But if you don’t want to use adapters nor rely on manual focus lenses there is really only one alternative for L-mount and three alternatives for E-mount:
- Sigma had adapted their DSLR design from 2016 for E-mount and L-mount pretty fast. But with the longer flange necessary for mirrorless cameras their 85mm f1.4 DG HSM Art became even bigger and heavier then the version for DSLRs. None-the-less the lens is a great performer and still commands 1070 EUR / 1100 USD / 930 GBP. See my Sigma 85mm f1.4 DG HSM Art review.
- Sony’s FE 85mm f1.4 GM is an original mirrorless design from 2016 for E-mount and costs about 1600 EUR / 1800 USD / 1500 GBP. It’s almost 200g heavier than Sigma’s new lens but otherwise similarly featured. See my Sony FE 85mm f1.4 GM review.
- From Samyang there’s the AF 85mm f1.4, an original mirrorless design from 2019 which is available for Sony E-mount and Canon RF-mount. It is the cheapest of the alternatives at 540 EUR / 600 USD / 480 GBP for E-mount and 600 EUR / 700 USD / 600 GBP for RF-mount. It’s of similar size and even a bit lighter than the new Sigma. But it does not offer an aperture ring or AF-lock button.
Focus accuracy and repeatability is critical to consistently produce sharp shots – especially with the narrow depth-of-field at f1.4. Repeatability (the accuracy of focus on the same subject after repeated focus-acquisition) of this lens is pretty good (measured 98.1% in Reikan FoCal) with no outliers over a series of 40 shots. There is only a little focus variation whether the lens focuses from a closer distance or from infinity and I detected a bit of hunting on complicated subject structures. The lens focuses in around 0.8 sec from infinity to 1m (1:10 magnification), which is not overly fast but still better than the 1 sec of the Sony FE 85mm f1.4 GM.
AF-operation of the new lens is inaudible from the outside or if you record video with the built-in microphone.
As you pull focus, you’ll notice quite some focus breathing: the image became 11% more magnified when I adjusted focus from infinity to 1m. This is very visible and could be distracting when shooting videos. But the Sony FE 85mm f1.4 GM and Sigma 85mm f1.4 DG HSM Art show even more focus breathing at 13%.
Next check out my quality results!Check prices on the Sigma 85mm f1.4 DG DN Art at B&H, Adorama or WEX! Alternatively get yourself a copy of my In Camera book or treat me to a coffee! Thanks!