Come on Neuro....you yourself posted that it was US only....
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Sorry, but there is a relatively large difference in detail between the two. That has nothing to do with dynamic range, simply the pixel size. The D800 resolves quite a lot more detail than the 5D III. That either translates into the ability to enlarge more with the same level of detail as smaller enlargements with the 5D III, or it translates into naturally crisper, sharper images when downsampling for smaller prints or online publication.
I know I'm in the minority, but I sure hope the 100-400 replacement is a push-pull zoom.