adwolf11 wrote:
I've also had a hard time calibrating it; the i1 claims that it is coming up with a good 6500k profile, but just eyeballing it, it looks much dingier than the other MBPs we have around the office (including a 13" rMBP); I feel like I can't trust the color output by this Mac.
I assume this is what you're experiencing, adwolf11, as shown in this photograph comparing a 15" Retina MacBook Pro (left) to a 15" Classic MacBook Pro (right). The Retina display looks "dingy," which is a good word compared to the bright and vivid Classic display.

This is a common complaint but curiously, not all Retina displays look the same. Some Retina displays look fantasic! I know because my first display looked fantastic that I regretfully replaced due to muras. Now I'm on my third yellowed display. Here's another comparison photograph with two units of the same model of Haswell Retina MacBook Pro. On the left, an in-store unit, looks pretty good. On the right is my dingy display. The display model numbers are different, but I can tell you that the same display model number can look different between units.

Unfortunately, this is just how Apple is selling computers. I suspect that these "dingy" displays are less susceptible to image retention and that could be why they're using them because I don't think I've heard of a display that has both yellow-tint and image retention. My Spyder4Elite couldn't remove the "dinginess" either.
Apple considers this colour variation normal. The Genius Bar won't take them back. I've spoken to senior Apple support people on the phone twice and the best advice I got was to take the display in to an Apple store where they would just tell me it's normal anyway.
If you're within your 14-day return period you could return it and get another display that is also yellow tinted. Or you could get one with image retention or other defects like stuck pixels or muras. This is just what Apple is selling these days for $3,000. Please confim if my photographs are representative of the problem you're describing or if I'm way off.