I am noticing a difference between the raw images from those two cameras using the same lens.
The 1D IV images seem to have more pop and depth, for lack of a better description.
Anything other then guessing would require a better description or, better yet, sample files. But since the 5D3 has higher IQ then the 1D4 across the board, some good guesses include:
* You're viewing images at the same image viewer magnification (i.e. 50%) without realizing this actually magnifies the 5D3 image much more.
* Different in camera settings.
* Different RAW converter setting defaults or profiles.
And if you're not talking about a test pair produced under exact conditions (same subject, lighting, lens, exposure, etc) then anything and everything is in play including lenses, exposures, focusing, selected apertures and/or shutter speeds (beyond the obvious exposure differences), subject, lighting, etc, etc.