xf 56mm f 1.2 on a T-X4 - focus issues?

I saw no one had replied to your question, so I thought I would jump in.  I have both an X-T4 and the 56 1.2 (non APD) lens.  I've never been disappointed in their performance.

But, I looked over some of the links you provided, and then ran some super-simple tests with my lens.  ... and there is something odd going on... but not sure its missed focus.

Sorry I don't have photos attached, but I used my sleeping dog as a subject and shot at f/1.2.  This was not eye tracking, obviously.

When I selected a center(ish) focus point and looked at the photos (on the camera, zoomed in) things looked sharp at the focus point.

When I selected a focus point out toward the 1/3 area, and did the same... things were slightly less sharp.  And when I moved the focus point closer to the frame edge, even more so.

But I'm not sure it was missing focus vs lens sharpness as you move toward edges of the frame?  I'm not the kind that does "brick wall" tests, so don't have other data to compare this to.

Outside of that example, I know I've had times where I focused on a person (again, not Eye AF) and then, for example, their coat was in focus but their ears blurry... that was my fault, for using the thin f/1.2 DOF and not accounting for the difference in distance between coat and face.

But all of _that_ said, I love the lens and the only real-world problems I've had with it have been of my own making.