Originally posted by Jerry Thirsty Maybe it's just me, but it looks to me like the results in the "Corner" column are significantly better than the crops in the "Center" column on the first several tables. As though maybe the column headers are switched?
No. This is not the case.
If you look carefully, you can see slight weaknesses in the corner (esp. for the M50/1.7).
The center crops appear lighter than the corners. This is normal. It depends on the exposure. You cannot get correct exposure for the center and corner in one image. This affects the contrast, but not the resolution (simplified). You can adjust contrast for the center crops and get darker bars, too.
All the 50mm lenses have excellent resolution data.
I was a bit surprised about the slight weakness in the corner of the f1.7 lens. "The internet" is often prefering the f1.7 lens over the f1.4. I never believed that and this test confirmed my doubts.
The main difficulty with these lenses is that manual focussing is really a challenge. I suggest to do focus bracketing, if the motive allows for that.