The Huawei Mate 30 Pro will feature a 90Hz OLED display when it launches according to the latest rumors. If it does, it will join the Asus ROG Phone and the OnePlus 7 Pro as one of the few handsets on the market with the feature.
https://www.notebookcheck.net/Huawei-Mate-30-Pro-to-join-Asus-ROG-Phone-OnePlus-7-Pro-with-90Hz-OLED-display.424057.0.html