You asked
Leica summicron m 35mm f 2 asph vs ttartisan apo m 35mm f 2 asph?
On paper these two are the same lens: 35mm, f/2, manual focus, no stabilisation, for full frame sensors on the Leica M mount. Both fit the same list of Leica M bodies, from the M9 through the M11 family. The difference is the maker, and the pages don't list prices or give a verdict on image quality, so I can't tell you which one is better value.
If you want the Leica name and its build, go with the Leica Summicron-M 35mm f/2 ASPH. If you want to try a 35mm f/2 on an M body for less commitment, look at the TTArtisan APO-M 35mm f/2 ASPH and compare current prices yourself. If you shoot close-up details, the Leica APO-Summicron-M 35mm f/2 ASPH focuses as close as 30cm, much closer than most M lenses.
Written by Claude from this site's pages.