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Thanks for the FC in the corner example shot with crops. That is the first shot I have seen posted with crops like that which shows it. Sorry, I try to follow your posts in the Zeiss thread but it is hard to follow with the high volume of that thread, easy to miss posts. I still would say it is a combination of FC and softness in the corner. I relooked at my f2 experiment shots where I slowly brought the focus pt. from infinity to MFD.
I still would say the 50MP is not anywhere as bad as a typical lens which we would classify as having FC like ZE 25,28, and the new 35/1.4. The curvature of field in those lenses extends much further across the frame than the 50MP which just has it in the extreme corners. IMO, that it doesn't affect to many shots unless you are looking for it.
And you need to get a 50P which gives more chances for 3-d with its faster falloff and less contrasty bokeh compared to 50MP, especially with medium distance shots like above and the shots I saw you post recently in the Zeiss thread.
Here is my experiment shot with 50MP at f2 with crops.
Yes, I know they are slightly off line to the left but you can still see the behavior.
Full shot, bottom left corner crop, bottom right corner crop, and center bottom crop.