One of the coolest parts about Sony cameras is the ability to adapt a metric ton of glass to them, but in the past, that has generally meant taking a gamble on autofocus performance. Nonetheless, the a9 and a7R III have both made major steps in this area, and this video shows just how good things have gotten.
Coming to you The Brotographer, this video shows some practical tests for shooting with Eye AF when using the Metabones adapter and a variety of Canon and third-party EF mount lenses. So far, it appears the results are mostly good news, with a few small quirks, but some definite improvement and very usable performance for most applications. A small note, though the video says it's not possible to use Eye AF on the a7R II with adapted lenses, it is possible in advanced mode, but that reverts to the much slower CDAF and isn't particularly useful, whereas the PDAF shown in the video is snappy. It's actually interesting, as lenses that are notoriously difficult to focus on a DSLR (such as the Canon 85mm f/1.2L II) really benefit from the on-sensor autofocus of the a7R III, and with the improvements in speed, they seem to end up performing better overall on the Sony than on their native mount.