Couldn't agree more about the Summicron quality as every day I shoot with my almost 40 year old Summicron-C 40mm f2 on my GXR I can't believe the sharpness.
I really dream now of a fast "affordable" lens in the 35mm - 45mm as I'm finding my A12 28mm lens a bit wide at times and the 40 Sum is a bit long at 60mm at times. The 25mm Voigt is not fast enough and the 25mm Zeiss is getting closer at 2.8. Of course, if I won the lottery and I still had money left over after paying everything off, I'd buy one of these:
Leica 24mm f/1.4 Summilux-M Aspherical Manual Focus 11-601 B&H