I wish I had an LG MBP to compare it too. My bro is going to be picking one up soon (15" MBP) so I'll check his to see which screen he has and do a side by side comparison. Won't be for 2-3 weeks though.
But anyways, maybe you can take it down to an Apple store and see what they say, although I'm about 75% sure they'll just say nothing is wrong and everything is "within design specs", lmao.
Just out of curiosity, does the bottom half look like it has a yellow tint in those pictures I posted? Just want to get a second opinion to make sure i'm not crazy. For those that claim their Samsung screens had the bottom 1/3rd yellow tint issue, how apparent was it?