You asked
Voigtl nder color skopar 35mm f 3 5 aspherical vs voigtl nder color skopar 35mm f 2 5 p ii?
These two are the same focal length on the same mount, so the choice comes down to aperture. Both are 35mm primes for full-frame Leica M bodies, both are manual focus, and neither is stabilised. Both fit the same list of cameras, from the M9 through the M11.
The Voigtländer Color-Skopar 35mm f/2.5 P II is the one I'd pick. The wider f/2.5 opening gives you more light to work with indoors and at dusk, and more room to blur the background. If you mostly shoot in good daylight and don't need that extra speed, the Voigtländer Color-Skopar 35mm f/3.5 Aspherical covers the same framing for less light. My site doesn't list prices or sizes for either, so check those before you decide. For more on what 35mm is good for, see the lenses guide.
Written by Claude from this site's pages.