More D600 vs. D700 dynamic range in the shadows

Why different ISO values ? Even on my old D300 ISO 100 looks better than ISO 200 although ISO 200 is the official base ISO value.

Crops : Same image size means you had resized one of the two images.

Lower ISO of D600 in addition with image resizing clearly puts the D600 far ahead. On the full size images though it becomes obvious that the "real" visual difference is much smaller than the crop might suggest.

No offense but I think that your test is a bit misleading since it makes the D700 look much worse than it actually is.