Other that the IR issue, overall is the Samsung panel brighter and cooler than the LG? What is your specification?
I'm seeking a second replacement and I've asked if there is any way Apple can instruct the factory to use a Samsung Panel!
Overall I think they are about the same for brightness. I didn't have backlight bleeding with the LG and I don't have it with the Samsung. No stuck or dead pixels.
And what do you mean specification? I didn't get to choose my panel if that's what you mean.