I have enough anecdotal evidence to convince me that if you score perfect or nearly perfect on this test, you see issues on most Retina iPad screens.
http://www.xrite.com/custom_page.aspx?pageid=77&lang=en
If you have really exceptional hue discrimination ability, you're going to see these subtle color shifts that most people just don't see.
That's fascinating. Indeed, I got a perfect score on the test.