My Chromebook Pixel is hands down the best screen I've seen on a computer, and my work laptop is a Retina MacBook Pro. My only complaint is that it's really sensitive to temporary burn-in; then again, so is every other retina laptop I've seen.
FWIW, I've never had any burn in issues with my first gen Retina MacBook in all the years I've owned it. Although based on many of the complaints I've read, that's because I was lucky to get the better screen.
The screen's also 8% sharper. (220dpi vs 239dpi). I don't have them side-by-side right now, so it's hard to say if that part's noticeable. I mostly base my judgement on the quality of the backlight in conjunction with the super-high DPI and touchscreen.