I have run many tests side by side with the x34. Comparing wallpapers, games, Gsync pendulum test, etc etc. The Omen has visible color banding in the sky on the Gsync demo, the x34 does not. The Omen has visible screen flickering on the demo, the x34 does not. The Omen has color banding in dark room in games (that I have run side by side), the x34 does not.
These issues are panel related, not a driver update.