As far as noise profiles, the 7d and t4i are NOT the same.
Look at some of the images posted earlier in this thread...the iso noise is deplorable, well hidden with the web file sizes. Zoom in and check the clarity. Unless you have perfect light, the 7d is likely to give you a headache.
Pixel peepers should stay away from this body. I found it totally unacceptable for portrait work, unless you 'really work hard' to get the best light possible. Going from a xsi- known for its pixel level sharpness - to a 7d, the difference was like WTF?
Downsized, cleaned up images are not a way to show what images come out of the camera. I feel like its disingenuous. My goal is for hardware to produce the most incredible images possible. The 7d creates mush-tastic images. Also, the 7d's atrocious iso 100 noise is nothing like ive seen on any other canon camera. Not to kick the horse, but the sensor can also exhibit mosquito noise, which according to canon is not proper. my 7d came down with it twice.
The t2i version of this 18mp sensor kills the 7d version in terms of sharpness AND especially noise. And hopefully you dont run into the 7d's Af issues like i did...canon was never able to fix mine after 4 tries, and i had to take a big loss on that body.
get a t4i and enjoy it while you save up for a full frame, i would say.
The more info the better. I dont even bother listening to photogs when they say they are not pixel peepers.