Jonathan,
Aparently a number of photographic journalists were invited to the Nikon Press release where they were able to briefly use the 2 cameras. The comments were that high ISO performance is exceptional, better than the 1D mark3. That wouldn't suprise me as the pixel photosites are larger and the technology sensor equivalent. There was also a comment that the D300 had a 2 stop advantage over the D200 at high ISO's (although that would not actually be possible without additional Noise reduction!).
I'd say Canon are wondering what hit them at moment!
Terry
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