You asked
Leica noctilux m 50mm f 0 95 asph vs leica noctilux m 50mm f 1?
The two lenses are close cousins. Both are 50mm manual-focus primes for full frame Leica M bodies, and the site lists the same compatible cameras for each.
The main difference is speed. The Leica Noctilux-M 50mm f/0.95 ASPH is listed at f/0.9 on its spec sheet, making it the fastest M lens. It's heavy, and focus is very thin wide open, so it takes practice. The Leica Noctilux-M 50mm f/1 is the older design, made from 1976 to 2008, and it's a little slower.
If you want the most light and don't mind the weight, get the faster one. If you're after the older Noctilux character at a slightly slower speed, the f/1 is the one to look at. Either way, the Leica M mount page covers what fits.
Written by Claude from this site's pages.