High ISO in D7x

[Sanpete]

Has anyone ever tried out the high ISO settings on their D7x? I'd really like to see some 400 and 800 ISO full sized images. I'd be especially interested in seeing how much difference it makes at those settings to turn down the sharpness, saturation, and contrast.

In anticipation of those who will say that no one should use such high ISO, there are times where it's either high ISO or nothing, particularly for indoor sports and other nonflash photography.