Voigtl nder color skopar 28mm f 2 8 aspherical sl iis vs zeiss milvus 21mm f 2 8?

Here is what the site says about that.

From Voigtländer Color-Skopar 28mm f/2.8 Aspherical SL IIs: Voigtländer Color-Skopar 28mm f/2.8 Aspherical SL IIs: A prime lens by Voigtländer for Full frame cameras, 28mm f/2.8. Specs - Maker: Voigtländer - Focal length: 28mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Nikon F - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Nikon F): as marked, 28mm. - On APS-C (Nikon F): like 42mm on full frame; f/2.8 gives about the depth ...

From Zeiss Milvus 21mm f/2.8: Zeiss Milvus 21mm f/2.8: A prime lens by Zeiss for Full frame cameras, 21mm f/2.8. Specs - Maker: Zeiss - Focal length: 21mm (prime) - Maximum aperture: f/2.8 - 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, 21mm. - On APS-C (Nikon F): like 32mm on full frame; f/2.8 ...

Quoted from this site's pages.