I have been using Canon for a very long time. When I first started photography and working for Jessops, I would go over all the camera's in the shop, looking at what I couldn't afford and what was the best. I ended up going towards Canon, I really liked the L series lenses, high quality.
At the moment I'm using the Canon EOS 5D mark III with a 24-105mm lens as my standard set up. With a 70-200mm for portraits and zoom work. I have a few speedlites but I use mostly the 600ex-rt and 430iii-rt with the radio trigger for off camera flash. I think I only have a flash on my camera when I'm shooting a concert or event.