i cant see a huge difference in iq between d7000 and 7d sensor at high iso (2/3 of stop...maybe) and is AF, shutter lag, speed and so on the 7d is a better camera than d7000/d300s.
My biggest reluctance with getting a 7D is only the low light performance where it badly trails behind the likes of the D7000.
Not quite correct, there is a noticeable difference sensor-wise between Canon's 18mp and that sony 16mp across the whole spectrum, more so in Pentax's implemenation.
Plus 7d & d300 have the same fps and actually 7d has the worst shutter lag of all 3 (.45 vs .54 vs .64) and despite its price its a single drive camera without spot linked meter. Having said that, i like the responsiveness of 7d's AF, the reach and the build but i've never recommended it cause there is just not a single iso setting without noise