Brian, Hi.... I'm sure you are right on that. I wasn't saying there's no difference between the cameras abilities, that would be ludicrous; I was merely suggesting that the three cameras share the same imaging sensor? Performance could be boosted by a different processing chip and even firmware upgrades.
Do the Nikonians really think that the D700/D3 & D3S have different 12.1 MP sensors? I personally doubt it very much.
Other enhancements yes, but I bet that proven and well established sensor was common to all three.