>>4385435i have an r2 and an r2m. the r2m i bought about two months ago becaue the shutter on the the r2 doesn't fire reliably and i didn't feel like waiting for repair. the r2m does feel a little more solid. vfs and rf patches aren't as large and flexible as leica's, but pretty nice
as far as small 35mm lenses, the voigt color skopar is the smallest. nokton classic is what i have and is also very compact. i think one of the summicrons is very small but if you're thinking third party, light lens lab also has a small 35/f2. zeiss 35 biogon also looks comparably sized to the ultron