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How much can the mirrorbox/viewfinder impact the image? How likely is it? Given that the two examples are so similar, within margin of what's possible with my testing method, probably not much? So it's due to my lens? The photos come out fine though! So for both my cameras the part that comes after the mirrorbox is defective? I used the Davinci Camera app, the autofocus function, to measure whether focus is equal across the plane and it's not. At the left border it's 0.92. Moving to the right it gradually shifts until it reaches 0.48. I replicated this multiple times, very reliable. So what is it then?
