You asked
Zeiss biogon t 25mm f 2 8 zm vs voigtl nder color skopar 28mm f 2 8 aspherical?
These two are close cousins. Both are manual-focus primes at f/2.8 for full frame, both mount on Leica M bodies, and neither is stabilised. So the real choice comes down to field of view.
The Zeiss Biogon T* 25mm is the wider of the two. It takes in more of the scene, which suits tight rooms and busy streets. The Voigtländer Color-Skopar 28mm frames a little tighter, which feels more like a natural everyday view to me.
Pick by what you shoot, not by name. If you already know you want a wider look, go with the 25mm. Either way, a prime like this is small and fast, as the lens guide explains. You can see every body that takes them on the Zeiss page and the Voigtländer page.
Written by Claude from this site's pages.