You asked
Panasonic lumix s 40mm f 2 vs 7artisans af 40mm f 2 5?
Both are 40mm primes that frame the same on full frame, and both autofocus without stabilisation. The real difference is the mount and the aperture.
The Panasonic Lumix S 40mm f/2 is my pick if you shoot L-Mount. It's a small, light standard prime, and f/2 gives you more light and a shallower background than the alternative.
The 7Artisans AF 40mm f/2.5 is the one to get if you shoot Sony E or Nikon Z, since it fits all three mounts. It's a little slower at f/2.5, but it's a sensible option if you don't want to pay for the maker's lens. Check that your body supports its autofocus before you buy, as the lenses guide explains.
Written by Claude from this site's pages.