>>3311988You could try the 40mm f/2.8 STM pancake ($180 new), wider stuff is usually either expensive or manual focus-only.
here are some examples shot with a 1Ds Mark III (should be similar to your Mark II):
https://explorecams.com/photos/pair/canon-eos-1ds-mark-iii=canon-ef-40mm-f-2-8-stm