So I just got my K7 after 3 years using a K10. I did see the Canon 7D when researching, and its performance at high ISO was vaunted. Then there's a YouTube video, googlable with "k7 7d", showing how an autofocus for a 7D expensive Canon lens with built-in motor is faster than a K7's in low light.
Now, after K10, I'm super-happy with the autofocus. There's an ISO button now right near the shutter, both on the camera and the grip; still that reminds me of high ISO performance. I must say I don't really use the camera in such a low light as to warrant more than 1600. So I wonder what are the scenarios you'd prefer 7D, really.
I'm super-happy with the size, and that I could use all my lenses. The rugged construction, the SR, the no need to buy expensive and heavy Canon glass. Finally, I like being different from canikon-wielders. Looks like the year of staying with trusted gear -- a VW after a VW, a Pentax after a Pentax for me.
Still, I'd like more fodder to validate the K7 over 7D preference!