i had a 7D when it first came out. Although it had all the bells and whistles, the image quality was terrible. I'm using all top notch L lenses, and no matter what, I couldn't get anything great. My rebel was far better for image quality.
I'd recommend reading this review by Darwin Wiggett http://darwinwiggett.wordpress.com/2.../the-canon-7d/
I did all the same tests, and had all the same results. I also tried every af micro adjustment setting.
I ended up trading it for a 1D3.
I dont know what the newer bodies are like, but mine was brutal. I'd recommend trying before buying.
Hope this helps,