I know that there are people here that use other brands of camera, myself included. But I have never really felt the need to even look at this. Maybe I'll go and pock my nose in. Gary
You have to put them somewhere, I have a Century 8 x 10 inch view camera made in sometime from1918 to 1920, no Canon cameras existed back then.
Probably biggest reason is that most people on this forum are well invested in canon for digital, and having two digital systems is a lot to maintain. So their "other cameras" are mostly film. I personally am well invested in Pentax medium format from the 80s and 90s.