DisplayMate:

Switching from LCDs to OLEDs is a major engineering and manufacturing challenge, so I was eager to test and evaluate the new OLED iPhone X.

The result: Apple has produced an impressive Smartphone display with excellent performance and accuracy, which we cover in extensive detail below. What makes the iPhone X the Best Smartphone Display is the impressive Precision Display Calibration Apple developed, which transforms the OLED hardware into a superbly accurate, high performance, and gorgeous display, with close to Text Book Perfect Calibration and Performance!

There is a huge amount of detail here, a terrific take on OLED and on the iPhone X display in particular. No small feat for Apple that DisplayMate named the iPhone X as Best Smartphone Display.

[H/T John Kordyback]