You asked
7artisans 35mm f 5 6 vs zeiss loxia 35mm f 2?
Both are manual-focus 35mm primes for full frame, so the choice comes down to what you want to carry and how you want to shoot.
The 7Artisans 35mm f/5.6 is a pancake. It's small, it comes in four mounts (Sony E, Nikon Z, Canon RF, L-Mount), and it suits zone-focused street work, where you set your focus distance and shoot. f/5.6 gives you less light and less background blur, so save it for bright days.
The Zeiss Loxia 35mm f/2 is the one I'd pick for low light and a softer background. It's f/2 and it's built for Sony E only. It's bigger, but the extra light is worth it if you shoot indoors or at dusk.
If you're unsure, read the aperture and focal length guides first. They explain why that f-number gap matters so much.
Written by Claude from this site's pages.