See I don't understand why people are so eagerly waiting for glasses free 3D TVs without understanding the fact that there is a huge difference between 3D that you see WITH glasses and 3D without glasses or Auto Stereoscopy.
The viewing angles in an auto stereoscopic display is much less and also the overall popout effects will not be as good as what you see with glasses.
So yes eventually maybe in an year or two we will start seeing autosteresoscopic TVs but they will not provide you with the exact same experience as an Active Shutter/Passive Glasses TV.
If you have followed 3D, so far no auto stereoscopic display has been impressive. They all have their sweet spot and though there is good depth there is a limit to the pop out effects they can reproduce.
As for your earlier question
2D ratings
LG - 7/10
Sony - 8/10
Samsung - 8.5/10
3D ratings
LG - 8.5/10
Samsung - 7.5/10
Sony 6/10
* LG won't get 9 or 10 in 3D because of the jagged edges and the fact that ghosting is not completely eliminated also the 3D PQ is not the best due to the 2D weakness.
** Samsung and Sony are about equal in 2D PQ but the reason I gave it .5 extra is EX720 is matte and D6600 is glossy and people prefer that. So its slightly more vivid than the EX720. But for someone who likes matte screens and dislikes too vivid images then the scores can be inverted - 8.5 for EX720 and 8 for D6600