David Pierce, reporting for The Verge:
The 27-inch screen on the iMac with Retina display is, in a word, awesome. I just don’t mean that it’s very good — I mean it is genuinely awe-inspiring. It’s the kind of screen you look at and your jaw drops. You look at it and you don’t want to look away. It’s the kind of screen that makes my tweets look somehow more impressive by virtue of sheer, spectacular clarity.