>Linwood, any chance you could reprocess and repost both >images with no NR? That might be a more interesting >comparison.
Before I do, I found a nice tool you may know about, or may not. DPReview has shots of identical studio subjects with various cameras at various ISO's and lets you do a zoomed and non-zoomed comparison very nicely.
But to the request. D4 is on the right, D800 on the left, 1:1 zoom meaning that the cropped portion of the D4 frame is a much larger percentage than the D800.
This is a bit different, in this one I cropped each frame to about 6% of the frame, and presented them as the same size on the screen. That means the D800 gets about 3 pixels linearly for each 2 pixels on the D4, so its noise does not show as much. This is more of a "fair" way to judge I think, unless you plan to always crop the D800 more than the D4.