Don't let the truth get in the way of a key marketing spec sheet number... 32mp is always better than 20mp! /sThe diffraction limited aperture of a 32 Mpx APS-C sensor is f/5.2. An f/7.1 is basically reducing it to the resolution of about a 20 Mpx APS-C sensor. I had a 90D, a great little camera with a 32 Mpx sensor, but it needed my 400mm f/4 to take advantage of it. On the 5DSR, which is about equivalent to a 20 Mpx APS-C sensor, the 400mm f/4 was hardly better than the 100-400mm II at f/5.6. But, on the 90D, it was much better. So, you would have to pay a lot for a lens and carry a lot more weight to make 32 Mpx APS-C more worthwhile in practice than a 20 Mpx sensor.