Today I bought the Superman The Movie BD and watched the first 40 mins. Now, this is blu-ray. I knew I was watching a HD picture. With Superman Returns, I have to repeat in my head "this is blu-ray", "this is blu-ray", to convince myself!
I purchased this on BD and watch it with my HTPC. I also noticed a lot of color banding in blue places, ice, water. It was very distracting. To a point that I thought something is wrong with my setup. If other people see it too, I feel better!