Following up the first round of tests, I decided to look at center sharpness again, but in a room lighted by a window to the rear of the camera (to avoid flare)
Test Specifics
ISO 1000, 1/20 shutter speed, tripod mounted.
The Results
Center sharpness is surprisingly similar between the lenses. The "flare?" on the Summicron makes the blacks look not quite as black and a little washed out. However, the lettering is still crisp.
Full frame (Nokton image)
lNokton 50/2 at f2
Heliar 50/2 at f2
Summicron 50/2 at f2
Summitar 50/2 at f2
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