One of the major overhauls 343 planned for Halo: The Master Chief Collection was in upgrading Halo 2's cutscenes. And Blur Studios, the team responsible for remastering them, did a wonderful job.
You can watch them all, back to back, thanks to YouTuber Unyshek - The Halo Professor. If you're playing through Halo 2 while catching these scenes, you can hit the 'oldschool' button to compare just how much has changed. And it is quite the difference.
Here is the old school version in case you're interested: