The Cosina/Voigtlander 35/1.7 Ultron Aspheric gets my vote. This lens is compact, light, "sharp-enough and Fast enough" and has beautiful Bokeh. I just picked up a near mint one in Black with an M-Mount adapter for ~$300. Replaced one that I sold to a friend deployed overseas a few years ago. At a time when the Nikkor 3.5cm F1.8 LTM is over $1,000 and the Canon 35/1.5 is close to a $1,000- the Ultron is a bargain. Glad I have mine!