CMOS sensor and picture quality
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While it's acknowledged that Nikon uses image sensors principally designed by Sony in many of its digital SLRs past and present, the D3X's sensor was described in a recent briefing by Nikon USA's Silverman as an "original Nikon design" that does not and will not appear in cameras from other digital SLR manufacturers. It does however, share certain key specifications with the Sony-made image sensor in the Sony DSLR-A900, including size (24mm x 35.9mm), image dimensions at full resolution (6048 x 4032 pixels), the number of readout channels (12) and possibly pixel pitch too: the DSLR-A900's pixel pitch specification is 5.94ľm, while Silverman confirmed that the same spec for the D3X is 5.49ľm, which as of this writing probably means that one of the two camera makers is quoting the wrong number (and a little work with a calculator suggests that 5.94ľm is correct all around).
Update, December 1, 2008: Nikon USA has now issued a correction to the pixel pitch specification, restating it as 5.94ľm.
So, given the similarities between the DSLR-A900's and D3X's sensor specifications, they would appear to be related, but whether they're twins or third cousins only Sony and Nikon know for certain.
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