Well i find it ridiculous that part of this conversation is getting out of hand over a non-issue about panels being faulty....they are not, it's the same as the storm in a glass of water on nooooo my panel is a LG one i'm gonna return it.
I have a LG panel in my 2012 model and since i don't have any comparisation i really don't care, i work in a computer store which also sells monitors yes i can compare there but i'm not gonna buy 2 monitors i'm just buying one and that's the one i look at.
And if you really get picky, be my guest buy from 1 manufacturer 2 exactly the same screens hook them up next to each other, i will bet my right arm you will still see differences.
And the same goes for Toshiba versus Samsung SSD's these differences are well within QC standards by Apple.
But to respond just a tad on topic, i've just booted my VM Windows 7 on my MBA which has the same issue when in fullscreen Safari and on my Win7 installation the problem is not there, so apparently it's a OS specific feature and let's be honest you read on the top of the screen not the last 2mm on the bottom of the screen now are you, and if you do please seek help