You asked
Leica noctilux m 50mm f 1 2 asph vs ttartisan m 50mm f 0 95 asph?
Both are 50mm manual-focus primes for full-frame Leica M cameras, with no autofocus and no stabilisation. The Leica Noctilux-M 50mm f/1.2 ASPH is a remake of the 1966 original, and it's the one I'd choose if the Leica name and build matter to you. The TTArtisan M 50mm f/0.95 ASPH is faster on paper. Its page lists f/0.9 in the specs and f/0.95 in the heading, so check the exact figure before you buy.
If you want the widest aperture of all, the Leica Noctilux-M 50mm f/0.95 ASPH is the fastest M lens I cover. It's heavy, and focus is very thin wide open, so it suits people who enjoy a difficult lens.
Both fit the same long list of Leica M bodies, so the choice comes down to aperture, price and how much you want the Leica badge.
Written by Claude from this site's pages.