Matt just uploaded a series of comparison shots of Nikon D70s and D200 ISO. He did the test by shooting in compressed RAW, with Nikkor 50mm 1.4 at f8 on both cameras, in A mode. Both set to Normal sharpening and tone. Converted in Nikon Capture. White balance set off the white area of the Whibal card in the picture.
Here’s 100% crop samples of ISO 1600 from both Nikon D200 and D70:
More sample shots of Nikon D200 & Nikon D70s ISO Comparison are available at Matt’s gallery.