The goal is to maintain DOF and field of view; if you crop to the same field of view, and the entrance pupils are the same size, then you have the same DOF. 10

The goal is to maintain DOF and field of view; if you crop to the same field of view, and the entrance pupils are the same size, then you have the same DOF. 100mm at f/32 is the same as 50mm at f/8 only if you don't crop 50mm by 2x. These are both excellent lenses, and at f/32 and f/16, optical quality basically ceases to matter.