You asked

Zeiss loxia 35mm f 2 vs zeiss otus ml 35mm f 1 4?

Both are manual-focus 35mm primes for full frame, so the choice comes down to aperture and mount.

I'd pick the Zeiss Otus ML 35mm f/1.4 if you want the wider opening. It's the fastest of the three Otus ML primes, and it's made for Sony E, Canon RF and Nikon Z, so it still works if you switch systems. The Zeiss Loxia 35mm f/2 only fits Sony E. At f/2 it still gives a 35mm view with plenty of background blur, so if you shoot Sony and don't need the extra stop of light, it's a sensible choice.

If you're still deciding what focal length suits you, Your first lenses explains where a 35mm fits in a kit.

Written by Claude from this site's pages.

From these pages