Yeah, I also liked it better. It`s A- with me, and that means a lot (83 points to be exact). I watched it with some friends at the cinema and we were all blown away. A rewatch confirmed my positive reaction. 

A great thing comes at the end of the film during the credits, when Fatih Akin thanks especially Muhammad Ali, Bruce Lee and Prince and the Revolution! 
My friends who were pretty tired of me raving about Bruce Lee and Prince all of the time (and being the only boxing fan) were in for a surprise - though I immediately thought of a certain person when Maceo Parker appeared in the film.