[mst]

The border has objects over a large depth in the lenstip photo.... So where do you propose the focus in the border actually is?

"depth" on the left border maybe, but certainly not on the right. To me, the focus clearly seems to be in the image center, so the wall of the building pointing towards the photographer. That means that none of the corners and nothing on the right side of the image is near the focal plane. On the left, maybe, yes. Judging from that image, I'd assume a curved image field bent backwrads towards the corners.

Same for the second image you posted.

And if field curvature is going on, that should be reflected in the Sony MTF too?

Not necessarily, no. It's the maximum resolution the lens can deliver at a given spot, which requires it to be in focus (in that spot).