The KDE Plasma Linux desktop environment is already a feature-rich desktop for both productivity and gaming, but the KDE development team has been hard at work adding ever more features to the DE and polishing the experience. One of the newest additions to KDE, apparently coming in Plasma 6.7 and no...
With respect, if you cannot notice a difference between 720p and 4k on a 4k compatible screen, then you do indeed have something wrong with your eyes.