To be fair, Nikon is always able to tame the noise in Sony sensor while Sony themselves do not seem to have the means.
Allow me to quote from
Thom Hogan:
"... All else being equal (which isn't always the case) more pixels have some advantages over fewer... I've found less use for the advantages of the extra pixels of the D3x than I originally thought I would.
This was a surprise to me when I recently evaluated my use of the two cameras on assignments where I was carrying both: I shot more with the D3s than the D3x...
The thing I was trying to address in my article was what the camera makers--specifically Nikon and Canon--had concluded about pixels versus target customer.
My conclusion: they think that the amateur/enthusiast will respond more to pixels, the professional more to low-level pixel integrity. Thus, we'll get more pixels in the lower cost bodies."
This is why we have the 36 MP D800, and no 36 MP D4X.