You asked
What are the alternatives to the leica noctilux m 75mm f 1 25 asph?
Here is what the site says about that.
From Leica Noctilux-M 75mm f/1.25 ASPH: Leica Noctilux-M 75mm f/1.25 ASPH: A prime lens by Leica for Full frame cameras, 75mm f/1.2. Specs - Maker: Leica - Focal length: 75mm (prime) - Maximum aperture: f/1.2 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 75mm. Cameras it fits - Leica M9: Full frame - Leica M9-P: Full frame - [Leica ...
From Video: For filmmaking: - A body with full-width 4K (no heavy crop), 10-bit recording, and a headphone jack. - Fast primes or constant-aperture zooms, so exposure doesn't change as you zoom. - ND filters, because to keep the shutter at about twice the frame rate (1/50s at 25 frames a second) in daylight with a wide aperture, you need to cut light.
Quoted from this site's pages.