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Well, due to the multiple generations of copying, the image gets grainier, it gets less dense, whites and highlights get dulled, blacks turn kind of gray, the whole thing starts to look mushy. (I have seen a 35mm of Jedi where we're in the Emperor's throne room, the live-action footage looks grainy and black levels are kind of grayish...but the matted-in animated computer display on the wall looks perfectly dense and jet-black.)
The image degradation with generation loss is why ILM jumped onto VistaVision as a lower-cost alternative to 65mm. It's also why they used the later-infamous Color Reversal Intermediate for the VFX and opticals, so they could skip a generation and avoid additional loss. (Part of the reason so many of the effects in the first film were recomposited was not just to get rid of matte lines and such, but because the original negatives for those scenes were in such a dire state.)