Upload & Sell: On
I've owned both the 1DIII and 7D. IMO, the 1DIII is at least slightly better in every way (including ISO), except for its greater size/weight and some of the following comments. As mentioned by Caleb, the 7D has larger file size, because of its much higher pixel density; however, 7D images do not crop well, and so this is only a significant advantage when you can fill the finder with the subject. The 7D has an advantage over the 1DIII for this. I find that the 1DIII images have higher IQ and even crop better than 7D images; however, you very quickly run out of pixels when you start cropping 1DIII images. That's why I sold both my 7D and 1DIII to get a 1DIV.