7d 'seems' just a 50D with the decent AF system (and fast FPS). It is no doubt the best 1.6 crop camera Canon have ever made, but it's also probably not as good as it should have been, just going from oppinon that it's not the sharpest cookie in the jar, jack of all trades, master of none perhaps.
Yes not my own experiences, but it's not practical for me to test 5 cameras at once, side by side etc so of course I went on 'the general consensus' from users on here. Of course 7D owners will defend their camera, I'm not trying to cause a stir - I'm just making the OP aware of the 7D's reputation in some corners.