As I've said I don't have a set up to do any real color correction, nor do I have any references to go from.
For Empire I checked the vector graphs to see where the colors were peaking. Everything is nicely saturated, but it seemed that the same 25% boost to the yellow and green spectrums used for New Hope wouldn't be out of place.
Actually watching the full movie last night I had a feeling that the yellows were too bright (compared to the rest of the colors).
Below is a screenshot from the end of ESB. Now there IS yellow lighting coming from in front of the subjects so you have yellow on a gold '3PO, but does this seem wrong to anyone else?

Looking to the future... ^

3PO and Chewie share a quiet moment... ^
