I went into a best buy during the week and saw the horrible adjusted 50" version of this set. It was like a old washed out picture, after adjustments and some service menu tweaks, my set looks great!
(sevice menu on this set is pretty easy, my sony nx810 is a nightmare and I could not figure out anything in the nx810, tho I do not have to, but if I did I could not) use at your own risk tho....
Also I do see the slight bands that someone else reported here and maybe all panasonic sets have this, and mine started out at around the 90 hour mark, it has not changed since they first showed up, but I'm starting to believe that person, that maybe all Panasonic's do this, just some don't know yet or just can't see it, maybe. Now in saying that, it is not that big of a deal at all, and during 90% of normal viewing or even more it is not noticeable, if your looking for it only, if you do not look for it you will never know. I will keep monitoring it but I am at 225 hours and it does not seem to be getting worse (I hope it does not).
At this point, This tv is a great buy, 3D is great (yes I do see some crosstalk/ghosting but nothing compared to my nx810 sony, and only slight some at that, I'm very picky). The picture can be adjusted to similar lcd led sets, just a little darker.
speculation only, below
Anyone on the fence of getting one should and not look at the store displays (if you see that washed out picture also, at your local stores), also amazon is sold out of the 55" version, and the 50" went up a dollar, this looks like stock is going fast or gone for some, and I think best buy will sell out soon also at 850 for the 55" version (this is just my speculation, nothing more) the 55" may be sold out soon and/or the price may go up next week.