The biggest difference, to us outsiders (well, to me anyway) appears to be attitude. He actually seems like he wants to be a footballer, one that's part of a team. In recent years, it looked like he was playing football but really just wanted to be doing other things. Best example: the famous toilet event. Why the captain was out drinking and not with his teammates at the ground was totally beyond me.
Chief would never have done that. Buderus likewise. Johns may have wanted to go drinking, but understood his role..!
This year, he looks like the captain role suits him. He's matured a hell of a lot. And good on him too. THIS is the million+ dollar marquee player we've been desperate to see.