I used to think I'd NEED a 35mm focal length for street stuff, but recently I've been liking 50mm just fine. Lets me feel a bit more 'anonymous'. :-)
Regarding the Heligon (and maybe the Xenon too?), I can't see any significant sharpness difference (on the computer) between it and any other rangefinder lens I've tried (mostly Voigtlanders, Canons, and older Leitz's). Hmmm...
Go outside and talk to someone today.
Fuji X-Pro1; X100s; Fuji X20; some film gear sitting on the shelf.