The Sony a7R III has generally been receiving glowing reviews for being a more refined and capable version of its predecessor. In this video, you'll see one area that has seen a huge improvement is tethering speed, allowing for a much faster studio workflow.
I recently decided to switch from my 5D Mark IV to the Sony a7R III while adapting my Canon glass and couldn't be happier with the decision, as the autofocus has no problem keeping up when paired with the Metabones V adapter, and in some cases, it's actually better than a native Canon camera, as is the case with the Canon 85mm f/1.2L II USM, which has gone from surly and judiciously used lens to a mainstay of my bag once again, as I joyously texted a friend when I first tried it on the Sony. The a7R III is mostly about refinements, but those little tweaks all add up to a much improved shooting experience, and as this video from Evan Guttman shows, one of those is the vastly improved tethering speed that can now easily keep up with a fast-paced workflow. Comparing the speed with the a7R II, it's easy to see that it's a game changer for studio shooters.