You asked
Ttartisan 50mm f 2 vs voigtl nder apo lanthar 50mm f 2 aspherical?
Both are 50mm f/2 manual-focus primes for full frame, so the choice comes down to mount and what you value most.
The Voigtländer APO-Lanthar 50mm f/2 Aspherical is the one to pick if you want very high sharpness and no colour fringing. It's made for Sony E, Nikon Z and Leica M, so it's a good fit if you shoot one of those systems.
The TTArtisan 50mm f/2 covers more mounts, including Fujifilm X, Canon RF, L-Mount and Micro Four Thirds. If you use one of those, or might switch, it's the practical choice.
If you're shopping for portraits, either one works. Both give a natural, slightly tight view on full frame. See portraits for more on choosing a 50mm.
Written by Claude from this site's pages.