Steve,
I will offer my well thought, but uninformed opinion.
Fast Lenses (f1.4, 1.2) are larger and more expensive than the slower (f2 and f2.8) lenses that are currently available. To keep lenses small, light,and less expensive, faster lenses were sacraficed.
Why doesn't Contax-CJ produce a 25mm and a 75mm? The G1 and G2 are fine cameras with a realively limited market. They are pricey compared to many slr's. Although I and other find the G2 Rangefinder satisfies most of my photo needs, many more photographers use SLR's and P&S. Contax & CZ came out with a sensible range of lenses 16mm, 21mm, 28mm, 35mm, 45mm, and 90mm and a zoom. It is hard to believe there will be additional lenses. My thought that Contax's development investment dollars will be for a digitial body that uses existing lenses. I might add that in the G3 Wish List thread, others have proposed some evolutionary improvements for the G2.
Focusing accuracy: Although we cannot see the final focus, I have experienced very accurate focus.
Howard