Erwin Marlin , Nov 28, 2009; 11:48 p.m.
If you're comparing the 5D Mark I to the 7D, go 7D all the way. If you're comparing the 5D Mark II versus the 7D, it sums up to this: if you shoot landscapes/architecture go with the 5DMkII, for everything else go 7D. If you're comparing the video capability of 5DMkII and 7D, the 5D offer shallower depth of field and wider angles, but the 7D records better and much smoother, in several different fps and resolutions, and manages better camera panning and tilting during video recording.
P.S.: If you were comparing it to the 5D Mark II, I'd go for the 7D, save the extra $1000 dollars the 5D Mark II costs, and buy the 17-55 f/2.8 IS.