I used to shoot with film, but when I moved to digital I had a Konika Minolta DiMage. When I jumped into DSLR's I read review after review. I went and looked at and handled different offerings from Nikon and Canon. My son had brought a Nikon so I was leaning that way, but in the end the Canon won the day. It just seemed to fit me better and as Will says, I was investing in a system and I preferred the Canon lens line up over the Nikon. Since then I have gone through different bodies and many lenses and now use a 5D2. My son has a new Nikon D7000 now and while I think it is a good camera and I use it every so often, I feel at home with Canon so would not change anytime soon, if at all. I am a bit disappointed the 5D3 has come in so expensive in comparison with the D800, but I don't even want a 5D3 so it is a moot point.