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I have done more tests with A7R and 'Lux 50. It is actually possible to get acceptable sharpness in the corners at infinity even fairly wide open, if I focus on the corner, which Andrew (snowboarder already showed). The problem rather seems to be that, if whatever is in the corner is not in the same plane of focus as whatever I focused on, then what is in the corner is reduced to an ugly smear instead of just OOF. I am not technically minded, but the fact that this does not happen on the A7 suggests that this could...Show more →
Yeh, At f2.8, f4, f5.6, the corner look rather ugly. (it is not soft, but make me dizzy) It is not the lens, or it is not only because of Lens, the sensor magnify the astigmatism and Field curvature of this lens, which is usually good enough after f2.8 for landscape use with M9.
I am going to give A7 a test today. But I have made up my mind with picking A7 over A7R, for different reason.