let me refine the question a bit:
there are 35mm/f2 summicrons and 50mm/f1.4 summiliuxes available for $600-$800, which i could pop for if they are really better than the $400 CV lenses. i assume these are pretty old, given the price point, so what qualitative difference could i expect, both between different generation leicas, and new cv lenses?
i know it's a bit of a broad question, but i'm trying to get a good overview before i go shopping.