Long before the Pixel 3 devices were launched, rumors had it that the 3 XL would sport an OLED display made by LG. The device was released last week and reviews of its display have been extremely positive, all of which now makes sense as it's been revealed that the Pixel 3 XL sports a Samsung-made display, not an LG one as previously thought.
https://www.notebookcheck.net/The-Pixel-3-XL-features-a-Samsung-display-after-all.338726.0.html