You asked
Is the voigtl nder ultron vintage line 35mm f 2 aspherical worth it?
It depends on whether you shoot a Leica M and are happy focusing by hand. This is a manual-focus 35mm f/2 prime for full-frame Leica M bodies, with no stabilisation and no autofocus. It fits a long list of M cameras, including the Leica M11, Leica M10 and Leica M (Typ 240), so you have plenty of choice of body.
I can't tell you how sharp it is or how it renders from this page, so check independent reviews before you buy. If you want a fast standard lens for low light and people, the lens guide recommends a 50mm f/1.8 on full frame as a first prime. If you already know you like 35mm framing, this lens is a sensible choice. For more on sensor size, see sensor sizes.
Written by Claude from this site's pages.