In a normal in-camera JPEG shot at ISO 100, you probably wouldn't see any
difference between a D800 and an EOS 5D image because the normal dynamic
range of a printed (or screen displayed) image is much less than the dynamic
range of either the Nikon D800 or Canon EOS 5D MkIII. Where higher dynamic
range would show up is in images which have been processed to bring up the
level of the shadows. An extreme example of this would be a highly
underexposed image. Another situation in which you might wantto bring up
shadow detail would in in an extreme backlit subject.
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