Why so concerned about high ISO?

Don't have time to find a link for you right now, but from what I saw D3x displayed more detail resampled down, but the color rendition was inferior to D700 (at higher iso, that is). There are NEFs to download all over the net, sure you will google some source with both D700 and D3x on one subject.

D800 seems to be better with color than D3x, how much - we will see from some "true" tests in the future.
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seb