You asked
Canon ef s 24mm f 2 8 stm vs zeiss milvus 35mm f 2?
Here is what the site says about that.
From Canon EF-S 24mm f/2.8 STM: Canon EF-S 24mm f/2.8 STM: A prime lens by Canon for APS-C cameras, 24mm f/2.8. Specs - Maker: Canon - Focal length: 24mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Canon EF - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Canon) (Canon EF): like 38mm on full frame; f/2.8 gives about the depth of field of f/4.5 there. - Not usable on the larger-sensor bodies ...
From Zeiss Milvus 35mm f/2: Zeiss Milvus 35mm f/2: A prime lens by Zeiss for Full frame cameras, 35mm f/2. Specs - Maker: Zeiss - Focal length: 35mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: Canon EF, Nikon F - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Canon EF, Nikon F): as marked, 35mm. - On APS-C (Nikon F): like 52mm on full frame; f/2 ...
Quoted from this site's pages.