I believe the 9c81 is an LG and its about the same as the SR model 9c67 model. I've been through 10 different mbp and 4 of them were lg and I compared them to the 9c68 (samsung) and preferred the samsung over the lg. The samsung did have a slight yellowish whites toward the bottom but that didnt bother me in the end and the samsung's colors were so vivid.
The lg's all had good white all around with no yellowing but its over saturated with brightness. The colors red,blue,green,yellow(not too noticable in yellow) had over saturated in brightness and it looks faded/washed out and the color rendition is horrible. I guess if you like the lg screens and think that the color is great even after countless proper calibrations the lg screens were still washed out and doesnt have that vividness (and yes 2 of the lg screens I took it in glossy, so glossy or matte doesnt matter).
After the lg screens I exchanged the mbp hoping for samsung but they all ended up chimei but the last mbp I returned it and took the restocking fee. (I have 2 apple stores here where I live and exchanged 4 at one apple store without any restock fee and exchanged over 4 times at the other one while returned and took 1 restock fee on the 5th at that store). Then 4-5 months later I rebought the mbp and ended up with a 9c66 (AUO) screen and it was very vivid like the samsung and has no yellowing whatsoever on the bottom, I did that white box bottom and top test.
I'm glad that my current mbp has no yellowing and looks very vivid in colors and I'm thinking about buying the 17" mbp in high res and I'm praying to god I dont get an lg.
Another experiences with lg I had was with external monitors, I've exchanged 3-4 times at circuit city and ended up returning it a year ago buying an lg 20" external monitor and I remember the colors on it was not as vibrant either, looks washed out. The colors were similar to the mbp lg models and that the colors looks dull and just too much brightness mixed into it making the colors not vivid and look fake (just dont know exactly how to describe it).
But if you have an lg screen and love it because of no yellowing then just be happy with it and DONT I repeat DONT COMPARE THE SCREEN WITH A SAMSUNG ONE, you will be awfully disappointed in terms of quality, sharpness and vividness. I dont care how many of you guys say your lg looks great and looks vivid to you and you have to have the right calibration, I just wont believe it, I've compared extensively against one another and I highly, highly recommend and want an samsung screen again.