I like the colours on the 2004 DVD, but the picture had far too much contrast. That first Blu-ray release is a shocker, whoever did it really hates colour.
I think it's a bit late to inject a bit of verisimilitude into the look of The Great Escape, it's always looked like Stalag Luft III was situated in the South of France in the summertime. The MGM Blu-ray was too cold for me, but the Criterion looks about right, I wouldn't want it any colder or...