Is the canon ef 400mm f 4 do is ii usm good on aps c?

Here is what the site says about that.

From Canon EF 400mm f/4 DO IS II USM: Canon EF 400mm f/4 DO IS II USM: A prime lens by Canon for Full frame cameras, 400mm f/4. Specs - Maker: Canon - Focal length: 400mm (prime) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: Canon EF - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Canon EF): as marked, 400mm. - On APS-C (Canon) (Canon EF): like 640mm on full frame; f/4 gives about the depth of ...

From Canon EF 100-400mm f/4.5-5.6L IS II USM: Canon EF 100-400mm f/4.5-5.6L IS II USM: A zoom lens by Canon for Full frame cameras, 100-400mm f/4.5-5.6.

Quoted from this site's pages.