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At least, there only appears to be one manufacturer so far, this A027.
I haven't seen any others of the handful of ones I played with at apple store were that as well.
what concerns me is over time, maybe as gen 1 approaches EOL, perhaps mid cycle, perhaps earlier, definitively for future generations, is that its only gonna get UGLIER the disparities between screens if history is any trend with rMBP's. Once its streamlined people doing a quick review aren't gonna notice the difference, they're going to be benching it and moving on.
I expect it to turn into a total QC bloodbath once MacBook dips its price to mainstream audiences and becomes the standardized notebook. Oh boy are we in for good times. my first gen white "MacBook" (intel 13") had a nice screen (hopped to black macbook which had a worse screen by then, and was ready for something new so went for a 15" MBP non unibody, what a classy machine but crap shoot too) but i remember over time, as that mainstreamed, you saw some nice ones, and some oh my goodness netbook/disposable quality.
The Retina display will always look beautiful, there's no stopping that. But yeah I agree, quality control has gotten pretty bad with the rMBP and I don't see that changing with the rMB. But the majority of users won't notice a difference.