Exactly, If you get an S, or SS, the gunshots are rapid-fire and the glasses break with a high speed off the screen.
When playing with Vergil however, there are certain poses of him, depending on the weapon you carried till the end of the mission. For example:
Vergil with Yamato on his hand in a flying pose.
Vergil with Beowulf, having one leg high.
Vergil with Force Edge and Yamato, having them slightly backwards him.