I struggle with the comparison of the 5D with the D3 however as they are only comparable in that both have 12ish Mp full frame sensors. [a href=\"index.php?act=findpost&pid=182673\"][{POST_SNAPBACK}][/a]
That's not quite true, is it? They are also comparable because they both have the same sensor size; same FoV, same pixel count, same pixel pitch, same resolution. I would have thought that these two cameras are ideal candidates for comparison.
Comparing 5D and D3 images is like comparing apples with apples. Comparing D3 and 1D3 or 1Ds3 images is like comparing apples and oranges, to use a well worn cliche.
However, I can understand if you are comparing camera bodies and their features, rather than the images they produce, and are considering such factors as continuous frame rate, robustness, waterproofing, LiveView capabilities etc, then there would be little point in comparing the D3 with the 5D.
However, when comparing images, the fact that the D3 is a more recent product boasting a whole swag of new features, is not necessarily apparent in the image.
A shot with the 5D at ISO 3200 in RAW mode, using the same aperture and shutter speed as a correctly exposed shot from a D3 at ISO 25,600, is also effectively a shot with the 5D at ISO 25,600. The fact that the D3 has the convenience of an ISO 25,000 setting which brightens the preview so you can clearly see the shot you've just taken, is obviously a useful feature. But this feature is not apparent when comparing the two images after they've both been appropriately adjusted in the RAW converter with respect to EV compensation, temperature and tonality etc.