There's a lot to like about the Carl Zeiss C Biogon T* 2,8/35 ZM-it's quite compact, extremely sharp from edge to edge, and is priced attractively (for a Zeiss lens). If you're in want of an M-mount 35mm lens with a wider aperture, but don't want to spend the extra money for the Biogon T* 2/35,...
Very compact; All-metal build; Extremely sharp at all apertures
Manual focus only; Lens hood not incuded