According to reports, the Oppo Find X4 Pro is set to miss out on a periscope camera. Instead, the flagship will feature dual 50 MP cameras and a third camera that supports 2x optical zoom. The Find X4 Pro is tipped to receive a 6.7-inch, 120 Hz and 2K display, too.
https://www.notebookcheck.net/Oppo-Find-X4-Pro-specifications-leak-with-80-W-charging-dual-50-MP-cameras-and-a-2K-display.581439.0.html
The site I could find lists 1440 x 3216 as the resolution. As 2560 x 1440 is not 2K, neither is this. If the term "2K" is coming from the manufacturer, then we would do better to cover it critically than to directly forward what they say.
Of course it is most likely PenTile, which makes the actual density closer to that of 1176 x 2626, but that's a whole different story altogether.
https://www.gadgetsnow.com/mobile-phones/Oppo-Find-X4-Pro-5G