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On the nikon forums it is generally understood that Nikon maps the tones to emphasize picking up detail in the shadows . This comes at the expense of compressing the midtones . This of course gives the Nikon files better high ISO performance at the expense of mid tone separation . This can be seen in any situation where Nikon shares a sensor with Sony . Same sensor different in camera processing .
I agree, having used the 24 meg D3X and A900 side-by-side with their respective 24-70 lenses. Midtone response and subsequent color separation of the Sony was clearly better than the Nikon in most shooting conditions, but at the expense of the higher ISO performance where the D3X smoked the Sony. The 24 meg A99 improved the ISO performance by around 1 to 2 stops but managed to keep the midtone response fairly consistent with the A900 (I shoot both together at weddings)
