Jeff Adler , Dec 10, 2012; 10:44 p.m.
It's difficult to reach conclusions with these tests. You would need to test multiple examples of each lens. You would also need to shoot with film. Edge performance is hard to test because each digital sensor will react to the same lens differently. I have a number of 50/1.8 Zuikos and many 50/1.7 Rokkor and MD lenses. Shooting with film I would have to say the f/1.7 Minolta lenses are generally better than the 50/1.8 Zuikos. By the time of the MD, Minolta was not spending much on the exterior appearance or construction. For this reason the 50/1.7 MC Rokkor-X is my favorite. It's the last one with a metal barrel and aperture ring. I have a number of 50/1.4 Pentax lenses but not, as far as I know, an 8-element one. They are all pretty good but don't get used that much. Its's only because they aren't convenient to use. If I could throw in more lenses I would include the 50/2 AI Nikkor, the 55/3.5 Micro Nikkor PC, the 50/3.5 MC Macro, the 50/1.8 Canon FD SC (black front, aperure lock on back), the 50/3.5 Zuiko macro, the 55/2.8 Vivitar Macro and either version of the 50/1.4 Konica Hexanon.