And, after buying the MKIII, the noise is NO better than the current 5D, even though you get 60.4(+-) % more pixels--no where near "twice the pixel count." (12.7 vs 21)
21 x .605 = 12.7
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You've got your math a little wrong here as you do not get 60.4% *more* pixels with the 1DsMkIII.
In fact you get ((5616*3744)/(4368*2912)-1)*100% = 65.3% *more* pixels with the 1DsMkIII compared to the 5D.
The other way around the 5D has (4368*2912)/(5616*3744)*100% = 60,5% of the pixels of the 1DsMkIII , meaning you have 39,5% *less* pixels with a 5D compared to the 1DsMkIII.
Cheers,
Andrew