You asked
7artisans m 35mm f 2 8 vs zeiss c biogon t 35mm f 2 8 zm?
On the specs this site lists, these two lenses are the same. Both are 35mm f/2.8 manual-focus primes for full-frame Leica M bodies, neither is stabilised, and both fit the same list of Leica M cameras, from the M9 through the M11 family. The only listed difference is the maker.
I don't have reliable build quality, optical comparisons, or prices for either one, so I won't pick a winner on specs I can't check. If you already shoot Leica M, either will give you the same 35mm view. Compare them on price and reviews, and go with whichever maker you trust more. You can start with the 7Artisans M 35mm f/2.8 or the Zeiss C Biogon T* 35mm f/2.8 ZM, and check the Leica M mount page to confirm your body fits.
Written by Claude from this site's pages.