I saw a lot of Canon and Nikon cameras from Rio Olympic and I start wondering about photographers who use either Canon and Nikon system. Beside Nikon, Canon has a reputation of worst sensor compare to Nikon and Sony so far but I still see a lot of photographers and people using Canon DSLR. Well, I thought Sony sensors are way more superior than Canon sensor tho. I do have 5d mark 3 which has poor DR range but still useable for all purposes. I would like to know the percentage of Canon, Nikon, and Sony in camera industry and why photographers and people prefer Canon and Nikon system over Sony system.