Upload & Sell: Off
One thing to note about the 5d...if anyone has seen the noise charts posted in one of my threads by someone the other day...it actually shows the 5d's noise curve in the low ISOs to be closer to the Nikon cameras, starting very low at low ISO. I wonder if this is part of what makes the 5d images look "good."
That said, I sold all 3 of my 5d bodies last year to replace them with 5d2s because I needed the high ISO and didn't like the RF noise interference lines in the 5d (especially visible at high ISOs).
The color filter array on the 5d is "better" (better color separation), on the 5d mkII they lightened up the filter to get better high iso response. The 5d mkIII is a step in the right direction, but there are aspects of the old 5d that may still be better in the right light.
or you could just go to nikon