You asked
Voigtl nder nokton vintage line 35mm f 1 5 aspherical vs leica summilux m 35mm f 1 4?
The Summilux-M is the one I'd pick for most people. It's a remake of Leica's 1960s design, and it's soft and glowing wide open, which suits street, people, and mood shots. Its f/1.4 maximum aperture is also a bit faster than the Voigtländer's f/1.5.
The Voigtländer Nokton 35mm f/1.5 is also a manual-focus Leica M lens for full frame, with the same 35mm view. Choose it if you want a 35mm for Leica M bodies and the slightly different character suits you better. Both fit the same Leica M cameras, so the decision comes down to look and aperture.
For a 35mm's typical job, see portraits for environmental work, and check focal length if you're unsure about the view.
Written by Claude from this site's pages.