The Summarits are excellent. We had them for review and Frances paid her own money to keep the 50mm. Having had a couple of Summicrons (including the last pre-aspheric version) and the Summarit, I'd go for the Summarit: I find it has more 'sparkle' in the images.
Agreed...and the Summarit has a short focus throw which comes in handy on the street. I would imagine most here have never tried the Summarit. Well, here are two fans of the lens (who've actually used it).