I had a look at a 35mm print of ESB last year that had only been screened 3 times and had been kept in climate controlled storage. It had very little fade, you can tell from the opening logos in most cases.

We watched it on a steenbeck in a light controlled room, I only wish the owner would consent to having it scanned. What I can say is that Hoth is indeed somewhat blue, it looks very much like they colour timed the release prints to be blue to emphasize the cold, a pretty standard technique. It is considerably more blue than the on-set photographs etc. but nowhere near as blue as the SE.

I will download PSB if I can find it and take a look at it, I can probably organise another viewing of the print, so can compare and let you know how close it is.