Sorry guys, but I really haven't got anything to prove. I'm just pointing out the differences. No, I haven't done the tests you describe, but I'll tell you how I ended up with a 5D2.
I had a 40D and was temped by the 80% more pixels of the 7D, complete with new generation processing. So I went to Jessops to do a comparison, shot side by side and made 15in prints there and then in store, plus a few blow ups of small sections. Sure enough, the 7D was better, and operationally the 7D really is a fantastic camera, so fast, but IQ was not much better. Nowhere near 80% better, not that I was expecting that, though some people do assume that kind of comparison. Incidentally, 7D has identical pixel density to an Oly E-5.
They also had a 5D2 (similar total pixel count to 7D, 18 vs 21) and almost for fun I thought I'd do the same test. Side by side with their 7D, same lens, same aperture, same ISO, same in-camera JPEG presets, only the focal length adjusted for parity of framing (the shop's 24-105L). The 5D2 was just amazing - lots better sharpness, more detail and colour in the shadows, much less noise.
So I bought it. And since then, I've been constantly amazed at just how effortlessly it turns out sublime quality images. In post, you can pull out big crops, correct under exposure with seemingly little penalty, shoot at crazy ISO. Fabulous camera. Nothing with a smaller sensor comes near.