Hi there, thinking about picking up an rb67, I have a couple of questions. 1. How are the lenses for portraits? Photos that i see from pentax 67s always look like they have a lot of depth, with nice transition from sharp focus to out of focus areas. How are the mamiyas in this regard? I don't find searching flickr to be indicative of the actual image, so any first-hand advice would be great. 2. Is the only difference between the non-C, C, and KL the coating/contrast [besides the shutter I think in the KL]? Or is there a difference in sharpness/resolution as well? Thanks very much.