I see photography gear and companies as more diverse than when I first started getting into the hobby 10 years ago. Maybe I just didn't see other companies, but when I got into it, only Nikon and Canon were doing prosumer DSLRs. Now that technology has moved on and DSLRs aren't the One True Camera, I would say that Sony, Pentax, Canon, Fuji, Olympus and Nikon are all squarely in the prosumer market with a good range from low to high end. I sold all my Canon bodies and L glass to switch to the Sony mirrorless ecosystem, and haven't looked back once.