I've owned and used plenty of dslr bodies and can tell you the differences I see between fx and dx noise. Fx sensors in my opinion exhibit far more pleasant film grain-like noise, whereas dx mushes pixels together to try and hide noise, even with NR off. The detail the fx sensor captures at nearly all iso values is pretty amazing. I'm Impressed so far with the samples from the d7000, though still notice characteristics of a cropped sensor.
I'm curious to see a comparison done against Althea canon 1d mkiv or 7d (both cropped sensors)
Designer and Photographer http://fotoartbyme.blogspot.com D7K and D700 Zeiss 100mm f2 Makro Nikon 10.5 2.8 fisheye, 24 1.4G, 24-70 2.8, 70-200 VR II, 50 1.4G, 85 1.4G, TC20e III