You asked
Voigtl nder nokton vintage line 35mm f 1 5 aspherical vs zeiss distagon t 35mm f 1 4 zm?
Both are 35mm primes for full frame Leica M cameras. Both are manual focus with no stabilisation, so the real difference is aperture.
The Zeiss is the faster lens, at f/1.4 against the Voigtländer's f/1.5. That's a small gap, but it helps in dim rooms and gives slightly shallower focus. If you shoot mostly in good light, the Voigtländer does the same job.
Either one fits the same Leica M bodies, from the Leica M11 back through the M9, so you won't need to change cameras. For more on the mount, see the Leica M page.
My pick: the Zeiss if low light matters to you, and the Voigtländer if you want the simpler choice.
Written by Claude from this site's pages.