How do you like the Zeiss ZM 50/2 on the Fuji? How does it compare to the native Fuji lenses?
Also, are you shooting it on the Leica M as well? Any difference in performance on the Leica compared to on the Fuji?
This Zeiss is a fine lens, and there is no Fuji equivalent yet. Fuji will come out in early 2014 with a 56 f1.2 lens, but it is bound to be expensive. To me, the equivalent 75mm angle of view is fine for some portraits, tighter landscapes, and some walking around. Having said that, the Fuji X lenses are really good, I have the 35 f1.4 and the 14 f2.8. I do not shoot Leica M.
The other focal length I would like to have is the 75mm one, this would give me around 110mm equivalent. Leica makes very nice 75mm lenses in M mount, but they are too expensive for me.
As for using M mount lenses on the Fuji XPro1 or XE1, there is no problem at all. The EVF, with zooming in and focus peaking, works very well for manual focus. I normally use M or A modes, no problem a all. Even his last Saturday I shot my daughters volleyball game with the XE1 and the 50 ZM, with M exposure and MF, it was fun.