No, they're all pretty much the same. The bad color shift pictures are being taken when standing 70 degrees off center (i.e., your face would just about be touching the glass either on the sides or top of the screen). That's where the color shift is apparent (though in veryyyyy small amounts from straight on).
Coincidentally, unlike many other posters here at MR, I use my computer while sitting down in front of the screen, not standing on top of or next to it, so the 20" is just fine.
That said, if your planned usage includes sitting 2 feet to the right or left of the machine, and staring back at it at a very large angle, this machine is not for you.
People like complaining about something. Make it something they can photograph repeatably, and they'll do it. Forget the fact that most (not all, but most) of them would never have noticed this 'flaw' (which is also built in to every laptop on the market, btw) if they hadn't read about it first...
I can't wait for the new MB's to come out, so we can see if people start taking pictures of them at 80-85 degrees off center, amazed that there's a color shift...