The ROG Swift PG27UQ from Asus packs in almost everything anyone could want in a monitor: 4K, HDR, G-Sync, and a 144 Hz refresh rate. Asus will also sell the monitor pre-calibrated to professional-grade standards with excellent color accuracy and color space coverage. However, the ROG Swift PG27UQ will chew through wallets at USD $2,000.
https://www.notebookcheck.net/Asus-new-ROG-Swift-PG27UQ-is-the-first-4K-144Hz-gaming-monitor-with-DisplayHDR-1000-certificationr.305214.0.html