The best 35mm I've used on the R-D1 is the Nikon Nikkor 35mm f2.5 in screw mount, but some may feel the handling of that lens is awkward. However, it's unbelievably sharp.
The Canon 35mm f2 is a "Summicron formula" lens which I feel is better than the early Summicrons. Hard, bulletproof coating that rarely scratches, and TINY lightweight. Fantastic quality.
eBay is your friend for both of these lenses.
The Canon is creeping up in price, but $400 or so should get one. The Nikkor maybe about $300-$350 for a clean example.
You'll need an M-adapter.
As far as the CV lens, I like to have coupled focussing. I never warmed up to the Summaron, I don't know why. It seems a bit soft on the examples I've played with.