High ISO of D800 still amazes me as does the whole Nikon system

My point is that ISO 6400 is a stop too far on the D800 if you are looking for top quality wildlife pictures. These pictures are colourful and engaging, but the background is posterized. The detail argument is a separate argument, but I'm skeptical that the differences are visible at web posting sizes. So, the ""fair comparison" for me is that the D800 is good at ISO 3200 versus ISO 2000 on the D3 and ISO 800 on the D300. This represents substantial progress in five years, but I wouldn't be waiting for a D400 if I could see the fairy dust you see.

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Jim