MSI recently announced the Optix MAG281URF, a 4K high-refresh monitor with HDR400, GSync, and a low response time. The Optix MAG281URF is targeted towards eSports players who are looking for a viable 4K option without sacrificing input lag or framerate.
https://www.notebookcheck.net/MSI-outs-the-Optix-MAG281URF-4K-144Hz-28-in-gaming-monitor-with-1ms-response-time-G-Sync-and-HDR400-aimed-at-the-eSports-crowd.586569.0.html