If you took advantage of the Sigma ART sale and own a Sony a7RIII with Sigma MC-11 you are probably pretty happy with your purchases. It looks like the combination works very well together. I don’t personally adapt glass beside Leica M-mount, but I know a lot of photographers do that shoot two systems or have preferences. Sigma ART lenses are very well known and respected so I am sure there are many that would love to use them on Sony cameras and maybe we will be able to use them natively someday, but until then we will have to settle for the Sigma MC-11 adapter.
The Adapter even works with video, but you might not like the video color performance as much as the Sony a7RII if that was your previous Sony camera. The first color comparison video has emerged and the default profiles look a little inferior. In fact, it might take quite a bit of work to make the Sony a7RIII look as good as the Sony a7RII. Beyond color, the Sony a7RIII does seem to perform significantly better than the Sony a7RII while recording video, but color correcting video can be a chore depending on how particular you are and how familiar you are with the process.
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