Run the command in a terminal window to see if you have LG or Samsung: ioreg -lw0 | grep \"EDID\" | sed "/[^<]*</s///" | xxd -p -r | strings -6How can you tell which screen you have? And what's the difference on yours and others?
If it begins with LP it is a LG screen.
The 15in 2012 retina's LG screen was not good. People were complaining about ghosting and image retention and yellow screens. The samsung was the better screen or at least according to the people on Macrumor. I got a samsung screen in 2012 and it was perfect. This time I got a LG screen and it is more on the warmer versus a cooler color profile. It is quite nice. The LG are richer color especially in the black tones but the samsung seems to be brighter and a cooler white tone. I have not heard people complaining about the LG screen this year as much. Of course there are lemons on both screens. It gets down to personal preference. My LG is not quite as bright as my 2012 rMBP but it is bright enough. Hopes this helps.