Nothing, everything in there we have heard before even the action music, it's merely a mix between Gladiator and The Last Samurai. There is simply nothing new in this score and that probably why I thought is was simply ok.
I have been a Zimmer fan since the early days of Backdraft. I love his scores, but there is a line to be crossed between maturing his style and just repeating it. I do enjoy King Arthur but it's nothing great.