I currently have the Summicron 35 ASPH V1. It is a nice size for my M6 and performs nicely. Years ago I had a Zeiss Biogon ZM 35 f/2. I regret selling that lens as it produces lovely images. Ever since then I've had a desire to buy another Zeiss lens. The Distagon ZM f/1.4 is very appealing to me. While large is has some of the best optics available.
For those of you who own this lens do you recommend it highly? I've heard the build quality is excellent as well.