http://dc.watch.impress.co.jp/cda/review/2008/07/30/8930.html

Scroll down for 'real world' ISO tests, side by side. Above that there are pieces on dynamic range, bokeh etc.

Imo, the overall noise performance of the D300 is great, but from 1600 just look how much more detail is retained in the FX sensors.

Not a bad one among them - it's a great lineup Nikon have at the top end now.