When I played around with the flat model in a store, I did notice a green cast when viewed from the side. The clerk agreed it was there. What this means for flat/curved uniformity I dunno.
I have seen that with the curved sets, both by Samsung and LG. Their off axis performance is not as good as a plasma. I will check out the OLEDs on a trip I have scheduled and check that out with the new LG flat panel.