I did the story mode with Cecil and got to the end of his and the main one. He's like a god among the other characters now lol. He hit level 100 and my next highest is only in the 30s. So, I guess I could say I've finished a part?
Everyone else is pretty pathetic, and I have several who are still only first level. I just used Cecil a lot! lol. And, I played quite a bit for a while.