P.S. Ah-Ha! Contax G 45/2 has better MTF at f/4 than at f/8. Not really a surprise to those of us who've beheld one.

http://www.photodo.com/lens/Contax-G-Planar-45mm-f2-783

I'd expect the same of the konica hexar AF 35 and the comparable Leica and Zeiss lenses.