I quite like the pre-asph 35 on my M-M. The lens characteristics are the same as on other cameras-- tack sharp at f4 and up, nice glow and enough sharpness for me at f1.4
My copy must be back-focused at 1.4 in order to produce a sharp enough image-- if I focus accurately, it will come out too soft, hence the lens' poor reputation amongst some. It was optimized for infinity focus at f2.8, I believe. The CV 35/1.4, in contrast, is reportedly optimized for focus at 1.4 with focus issues at f4. I usually shoot twice the frames at f1.4 to make sure I get the shot I want.