The Sigma 50mm f1.4 Art is without a doubt a very high quality standard lens with autofocus for Canon, Nikon, Leica L-mount or Sony full-frame cameras. You’d expect it to out-perform the cheaper Canon EF 50mm f1.4 USM and Nikkor 50mm f1.4G lenses considering it’s roughly twice the price, but the big surprise is how it also delivers better performance in most aspects than the Canon EF 50mm f1.2L USM and the Nikkor 58mm f1.4 and is neck-and-neck with Sony's FE 50mm f1.4 ZA despite both these lenses coming-in at almost twice the price. And if you’re a Leica L-mount owner, it’s a bargain compared to the 50mm options from Panasonic and especially Leica itself. When you also consider Sigma offers a service (paid) to switch mounts should you swap camera systems in the future, there really isn’t any reason not to get the 50mm Art if you can afford it. The only downsides are greater longitudinal chromatic aberrations than the more expensive rivals and the fact the body isn’t weather-sealed. So the Sigma 50mm f1.4 Art is a very good lens, out-performing models costing even twice the price. It sets a very high bar for price / performance ratio of 50mm f1.4 lenses and easily keeps our Highly Recommended award even several years after its original release.
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!