I was really excited about the 5D3's RAW, especially at the $3,000 mark.... but I cannot get over the fact that on the "DSLR" side -- the photo side, it is not IMHO at the top of the game (NIKON D800). The sensor IMHO is a really old sensor.
If it was the best in its market segment with respect to imaging, then I would have bought it a week ago. But at this moment, there are just too many options in the horizons with much better workflow (I don't have after effects, I don't want to buy extra CF cards, I don't want to mess arround with alpha/beta firmware, etc -- I'm getting married in a couple of weeks :-).
Besides, a game changing camera seems to be coming out every other month. Because of these reasons I will wait... but the camera is tempting even though I really don't like Canon as a company.