Sign [Q] AMOLED grays - Prospective Buyer

I am a prospective buyer of the Moto X and have my heart set on this phone. However, after using a friend's piece for a while today, I have concerns about the display.

I found the AMOLED display did not render the grays very nicely. They we very reddish brown in my opinion. I understand this is an AMOLED problem, but the X is supposed to have one of the best AMOLEDs out there.

Is this a problem generally in the X or was that perhaps a problem with that particular piece? Is this problem solvable via software?

Thanks!