You asked

Is the voigtl nder ultron vintage line 35mm f 2 aspherical worth buying used?

Yes, I'd look at this one used. It's a 35mm f/2 prime for full frame, and it's manual focus only, so it's a lens for photographers who like to focus by hand and want a focal length that's easy to live with every day. Buying used is the sensible way to get it, as the buying used guide explains.

It mounts on Leica M bodies, and the lens page lists plenty of them, from the Leica M (Typ 240) to the newer Leica M11. If you're buying the lens first, pick a body you can already afford, and don't forget the battery budget on any used body.

Written by Claude from this site's pages.

From these pages