I recently got a week 44 rMBP that has the Samsung display. As others have noted, the stock color profile is a bit washed out and reddish/yellow. I created a new icc profile that I'm much happier with. Of course, if there's a wide variance in how these displays are tuned before they ship, then mine may not help correct your specific color issues. Just thought I'd give it a shot.
http://www.filedropper.com/rmbp15samsung_1
http://www.filedropper.com/rmbp15samsung_1