On an R-D1, for me it seems to be all about using your 35mm lens. 🙂
Now I have three 35s, including the Canon 35/2.8 -- which was my first. It's a very nice lens, good on bright days, as has been noted already. The chrome version is very small and solidly built. The black/chrome version is not so compact, but a little more ergonomic, IMO, and its front element is more deeply recessed, making a shade unnecessary. (I guess I really have four 35s, two of which are the Canon!)
My other 35s are a Summaron 35/2.8 LTM and a UC-Hexanon 35/2. So far, just by gut impression, the UC-Hexanon is the "best" for sharpness, color rendering and bokeh. But there's something about the Canon's tonal rendering in B/W that keeps it in the running. I'll have to do some more controlled comparisons soon and share the results.