So I went to the regent street apple store yesterday to check out the airs on display there, and after checking display models, found they had a LG, Samsung and (the other) screened airs all on display.
So I put them all in a line and here are my thoughts...
LG: Absolutely abysmal for contrast, so really not great for reading, also colour balance seemed to be slightly greenish, which I dislike. BUT the colour of the apps etc themselves were quite natural, and the screen was brighter.
Samsung: Fantastic for contrast, much easier to read from and just felt sharper all round. BUT it almost seemed to have too much contrast, so with the space desktop background, the screen seemed particularly dark. In addition, the screen seemed unnaturally warm, so that colours were overly yellow (as a photoshop user, it was like when you push contrast to a point where it is unnatural).
(other screen): Sorry but not sure of the manufaturer of this one, but it seemed to sit inbetween the other two. Basically a bit more contrast than the LG (enough to make a decent difference for reading), and a more natural, less dark appearance than the samsung. BUT it did seem to have a slight pink hue, again leading some sites (notably macrumors) to look a little odd.
Wildcard comparison...
I then took a look at the rmbp 13" and the screen was not only nice and contrasty but the olours were also natural.
Now I'm really confused!