Get Sony G Master Lens at B&H Photo.
A few days ago, I showed focus error with the Sony 85mm f/1.4 GM on the Sony A7R II. That was with firmware 3.0, with version 3.1 recommended with the 85/1.4 GM.
But it seems the firmware version has nothing to do with problematic performance.
Using the Sony A7R II with the very latest firmware (version 3.1), I put focusing to the test under controlled conditions in which every effort was made to help the camera succeed.
Shot at two different distances and at both f/1.4 and f/4 to confirm the findings.
I prefer my images as sharp as the lens can deliver, which is why I do all my evaluation work with manual focus whenever feasible, which is almost always.
So we can forgive some error at f/1.4 (but on mirrorless?!), but what about f/4 too?