Only characters that actually completed the storyline in 1.0 get the different scenes. And even then, it's a pretty minor difference.
Yes, the character had to have finished the main storyline in 1.0 to get the different scenes. I have two accounts, one with a character that finished 1.0, and one with a character I only got to 32 (this account). My finished character got the different cutscenes. This one did not. There was a thread about this on the beta forums, and it's been confirmed by other players sharing their results that you need to have finished the main storyline to get the different cutscenes. We don't know for sure if there are OTHER requirements as well (such as specific battles), but we do know for certain that the character needs to have finished the main storyline.