To be honest Pete, think it was a bit of both. Using the DVE disc, when you go to Chapter 14 (system evaluation I think) you get a set of frames with just pure coloured gradients of red, green, yellow, blue and white. The highest contrast white screen showed an incredibly inconsistent tone with dark shadows around 3-4 inches in from each side (similar to the so-called 'lung effect') and then you had various seperate coloured patches of pink and blue in each corner.
In the real world, only the coloured patches were noticable in day to day viewing however especially on black and white films
I don't know if this seems really picky or not but I tried the same tests on a 32" Sony, 32" Panny and even my 21" Samsung in the spare room and on every one the white tone was pure, bright and consistent across the whole screen.