Glypo, the reason you see more sports guys using Canon is because many moons ago Canon released the EOS 1 which had the eye operation system (EOS). At the time Nikon were still running the F4 as their flagship model. The 1n was a far superior camera with focusing times and frame speed that made the F4 look antique! In the world of sports photagraphy, speed is king. Obviously everyone bought a 1n as their camera body and built their kit around that. Nikon brought out the F5 soon after that but by then everyone had already bought the canon and were unwilling to go through the hassle and expense to switch brands for no real reason. You will see alot of paparazzi and press photographers using Nikon due to the fact that they all used the olf F3 then F4, F5 and so on so stuck with Nikon to retain the lense compatibility. Long winded but I hope that explains it for you.
