This population mapping tool has been popular on the Canadian section lately. I can't vouch for the accuracy, but, for what it's worth here's a population comparison of each of Germany and Canada's 3 largest cities as measured from a 3km radius of each city centre (note: I played around a bit with the location to get the largest number for each; omitting water and large parks as much as possible).
https://www.maps.ie/population/
Berlin
Munich
Hamburg
Toronto
Montreal
Vancouver
Threaded Mode