My expectations are not too high by any means, my early 2011 as well as my late 2008 MBP's have uniform screens, albeit non-retinas. There are Windows laptops out there with perfectly uniform lighted screens also (not that I am going down that path ever again) - so it is possible. The problem is Apple's shoddy quality control, or perhaps a problem with the retina screens in general.
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My 2013, and 2014, my neighbor's 2013 and both daughter's 2013s and my spouse's 2012 all have just as uniform a screen as my old 2008 MBP model.
Are you sure your eyes are not uniform
In any rate do you see any difference in retina screen quality 2012 - 2014? If not then I'm just saying the discussion/comment is off topic.