I liked the new scenes in Sephiroth's battle with Cloud a lot. The wing was epic and the stabing brutal but, at the same time, very amusing!
I lol'd when Sephiroth throws Cloud in the air like if he was just some toy.
I really love the scene when cloud is trying is get on his feet and we see Sephiroth up there, in the middle of the swirling clouds. It was so...beautiful!
I wish the battle lasted a bit longer, though, just to get a little more footage of Sephiroth as the One Winged Angel, but all in all, it was epic!
Other than that, i loved to hear Sephiroth's voice when Cloud has a Geostigma attack when he was at the place Zack died.
His voice sounded so calm, yet so intimidating. I loved it!
And finally, the new Sephiroth flashback (while Kadaj and Rufus are talking) has something of ominous about it, but it's also very cool:
I loved how Sephiroth's image over Kadaj looks slighty towards the camera. It's so beautiful!
The eerie sound that is heard when Sephiroth uses the Masamune was also a nice touch