While ZTE is about to debut the first shipping smartphone with an under-display selfie camera in a few days, Xiaomi has announced that it will be debuting a better solution next year. The company has announced that its third-generation under-screen selfie camera tech matches the expected performance of a regular front-facing camera, which it implies ZTE's technology can't yet match.
https://www.notebookcheck.net/Xiaomi-third-gen-under-screen-selfie-camera-tech-to-debut-in-2021.490252.0.html