No offence, but I think we are going against the limits here.
No doubt Canon has made their latest 7D the densest APS-C crop sensor in the market. (Why, cos they can't push 51-AF points into their camera i guess).
If you do the calculations they could easily be anal and stuff 50 million damn pixels into the 1Ds 4 or whatever it is called...
Which would you want? More pixels or less noise?