You asked
Leica noctilux m 50mm f 1 2 asph vs voigtl nder nokton 50mm f 1 2 aspherical?
Both are 50mm f/1.2 manual-focus primes for full frame, neither has stabilisation, and both are made for Leica M bodies. The difference is the mount. The Leica Noctilux-M 50mm f/1.2 ASPH is Leica M only, a remake of the 1966 original. The Voigtländer Nokton 50mm f/1.2 Aspherical also fits Sony E, so it works on Sony bodies, and on APS-C it frames like 75mm with the depth of field of about f/1.8.
If you shoot Leica M, both are on the table, and the choice comes down to the Noctilux's heritage versus the Nokton's flexibility. If you shoot Sony, the Nokton is your only option here. I can't compare prices or sharpness from what the site covers, so check those before you buy. For a first fast 50mm, see portraits.
Written by Claude from this site's pages.