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I've been studying their review and the graphs and I would like to point out the following things.
The Tonal Range, and SNR graphs show that the D800 and D4 are near identical for these measurements. Except for the fact that the D4 continues, in a near linear fashion, to a much higher ISO sensitivity.
For Color Sensitivity, below ISO 160, the D800 is ever so slightly better then the D4 but for every equal ISO above 160 the D4 is ever so slightly better.
As far as Dynamic Range goes, below (aprox.) ISO 200 the D800 is clearly superior to the D4....Show more →
1/2000 and ISO 100 isn't uncommon for daylight sports at all. ISO 100 use isn't uncommon at all in general.
I see what you're saying, but that's why they have the curves with ISO - If you know you'll never use less than ISO400 for example, you know to disregard those values when comparing sensors for your use.
WRT the D800 vs D4, those curves aren't saying the D800 is the best camera for anything ever. It is saying that while you get arguably the best low ISO camera, you also get a very fine mid and high ISO one. Incidentally, if the DR scores are accurate then even putting the resolution thing aside the D4 will be nicer to use at high ISO as it has significantly more DR - there won't be that 'flattening' of the image to the same extent.
I want to find the thread from late 2011 comparing the D7000 to the D700 and extrapolating D800 performance, it was nicely accurate though a little overoptimistic on DR.