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I personally dislike the 50mm focal length. It´s too tight as a walk around and too short for a portrait/tele lens. I used it exclusivly for one of my vacations as a snapshit lens, and i was never really happy with it. I think it only really works on M43, since you get a bit more headroom because of the 4:3 ratio.
Minolta had the right idea, when they created the lens line for their M-mount CLE camera: 28mm, 40mm and 90mm is all I would ever need. YMMV of course