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Simple answer 35/2 ZE gives the most true to life street shots EVER in 35mm, period. And a lot of the time it translates to 3D, and in some cases really nice pop..
The 50/2 MP ZE gives the most crackling pop but ONLY at certain distances, and apertures. 3D is there...
The 100/2 MP ZE is in the same boat, but even more tricky then the 50mm.. And less so on pop but more so on 3D.
The C/Y lenses have it here and there (haven't used all the N lenses), the older 100, and some of the ZM stuff is decent 50/2 ZM (funny to replicate) and 35/2.8 ZM is pretty good at it.
As for other rangefinder lenses you can forget about Leica, it seems they go after a totally different aesthetic IMO, although not bad by any means, just not what I consider 3D or pop really...
No experience with Sony Alpha BTW.
I seem to have a hard time putting down the ZE lenses in favor of my MFD Hassy... That's how much I like them!
Think I should have invested in a 503 setup rather then an HC system or maybe contax MFD..
Any who, just my opinion.. but cannot go wrong with the ZEs or ZFs (depending on what body you shoot with).
EDIT: Have to admit nixland's #2 Leica Summicron 90/2 shot is pretty good, which is something I found really hard to get from my 90/2...