https://www.gamespot.com/articles/xbox-one-x-enhancements-for-halo-5-revealed/1100-6454711/

Microsoft's Halo 5: Guardians is among the more than 130 Xbox One games that is getting or already has been updated to take advantage of the Xbox One X's power. Now, 343's studio head for FPS games, Chris Lee, has revealed more specifics about how Halo 5 leverages the power of the console.

In an interview with the Xbox Wire, Lee said the Xbox One "provides a ton of additional power." Specifically, the level of detail on elements that are further away are increased. And if you have a 4K TV, you may notice a "ton of detail" on things like characters, weapons, and vehicles, beyond what you would see on a 1080p set.