the wider than 50's are interchangeable on both bodies, so both are even on that score, whether it be classic NRF lenses, Kiev lenses, or modern Voigtlander SC 21/25/28/35 lenses, or the Voigt SL 12 or 15 with the proper adapter. Most Ruskie 35's however won't mount. SOFAIK, No Ruskie 35 will meter properly on the R2C / R2S due to to a blocked meter cell.
Classic Nikon RF lenses are much more plentiful than post war Zeiss, but this is offset by the pre-war Zeiss Jena lenses, and the post war East German Jena and Russian Kiev lenses.
The modern Voigtlander S 50/3.5, 50/2.5, 50/1.5, and 85/3.5 only focus properly with the Nikon mount bodies, or the Bessa R2S -- not the classic Contax mount Contax or Kiev bodies.
The Bessa R2C body is $599, the R2S body is $499, while the R2S is $749 with the superb Voigtlander 50/3.5
Heliar -- rated by PopPhoto as the sharpest 35mm format lens they ever tested.
To me, the R2S NHS set at $749 is a better deal, with the added benefit of modern 50 and 85 lenses if you so desire them. see info at
http://cameraquest.com/voigt_r2s_r2c.htm
Stephen