It just works, period.
Additionally it can also correct motion up to a certain degree.
It's difficult to overstate just how quick the focus is when shooting.
This image has been converted and processed to taste in Adobe Camera Raw.
There's perhaps a touch more contrast and punch in the extreme edge of the frame, but it's tough to tell even at 100% view on the files from the A7R IV.
Rumors and features While you'll find lots of lists of reported Sony A9 III specs online, most of these appear to be based largely on speculation, rather than leaks from Sony.