Yeah the OST is incredible and I actually have a lot of love for some of the background and atmosphere but New Gen. and 2nd Impact are on another level with the background presentation.
You can see the use of photos in the Dudley stage and if you compare it to the wonderful Urien background you can see a difference in quality. I think there might be some photo use for foilage on Ryu and Makoto’s stage, need to have a look again.
Some others that have 3D assets are Alex/Ken’s, Yun/Yang’s, and Gill’s, maybe some others too (Ryu’s castle? Makoto’s Buildings?).
Lots of cool stage intros and stage changes throughout the rounds add a ton of personality.