I started with video, with the advent of HDSLR video with interchangeable lenses I saw the future, but my T1i was pathetic with video, still better than most of what was around, but 20FPS at 1080?? Terrible moire and on and on, laughable, but taught me a lot, and I eventually got into photography (well who would have guessed it's a photographic tool with a video mode) through that, now it's a 5DII and I'm shooting portraits, events and weddings.
But, now that I'm getting back into video work, and Canon hasn't wowed me (or anyone) since the 5DII, and with the 5DII and IIIs inherent load of disadvantages compared to everyone else in the competition, I'm now moving to mFT with the new GH3, soon. Though, I'm both so familiar with Canon and so invested I won't leave the system behind, so far as a second camera for video, and for all of the photo work it does marvelous work, especially with such great lenses as the Sigma 35, which sure, doesn't justify staying with Canon, but it's not cheap and I have it in EF mount so again as an investment goes I'm sticking. Further reasons for sticking though, I've always preferred Canon for the ergonomics, few Nikon grips felt like they could stay in my hand, some Canon's are no good but those are the lower level ones, Nikon only made a few pro cams with grips made for human hands, where Canon understands what's comfortable and usable. And the controls, operation, what a lot of people like with Canon.