https://techcrunch.com/2017/11/06/tests-give-iphone-x-display-top-honors-but-camera-is-merely-competitive/

Lab tests on the recently released iPhone X put Apple’s new flagship in the highest tiers of quality when it comes to the display and camera, but it’s only in the former category that it truly leaves the competition behind. Of course, what’s the point of having great images if your screen can’t show them properly?

Apple doesn’t tend to make their own displays; but while LG, Sharp, and in the iPhone X’s case Samsung rightfully deserve credit for making them, Apple doesn’t just snatch them off the shelf. A ton of money and time is spent customizing and tweaking them, and phones are individually calibrated before they ship to account for variation in the manufacturing process.