You asked
7artisans af 135mm f 1 8 vs sony fe 135mm f 1 8 gm?
Both lenses are 135mm f/1.8 primes for full-frame cameras with autofocus, and neither has stabilisation. On full frame they frame identically, and on APS-C both behave like about 202mm with the depth of field of f/2.7. The site's specs don't say which one renders better, so I won't pick a winner on image quality.
The real difference on these pages is mounts. The Sony FE 135mm f/1.8 GM is for Sony E bodies only. The 7Artisans AF 135mm f/1.8 also fits Nikon Z and L-Mount, so it's the one to consider if you might switch systems.
For tight headshots and blurred backgrounds outdoors, the reasoning in portraits applies to either. Check current prices and independent reviews before you buy.
Written by Claude from this site's pages.