The Contax G lenses are -by far- the best lenses in 135 that I've used. The Contax G1 body is ergonomically brilliant and the perfect travel companion.
I got my G1 + lenses two years ago. Wish I had done so 10 years earlier (not pricewise though- the system is a steal these days).
The 28mm, 45mm and 90mm are the nicest starter lenses, in that order, IMO.