Coming myself from a Nexus 4 I did immediately notice the different hues in the screen color, and I wasn't such a fan of it, but after a week I found that I actually prefer the AMOLED display of the Moto X. I understand your concern, however I don't notice any yellow tinge to the screen.
Overall the AMOLED screen truly is beautiful so I don't think you need to worry too much. The contrast and the darks look amazing. Obviously not 1080p but amazing none the less.
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Ok Google now