I think both movies are great and independant on their own. Although the original had far more acrobatic stunts, but considering the two main characters are getting older this is to be expected, but loved the Ultimatum as much as the original. Very much agree do not watch the dubbed versions they are atrocious, best to read the subtitles.
One of the main two good guys actually got a pretty good "bad" part in the last Die Hard (Live Free of Die Hard) movie because of his acrobatic stunts. (he was the guy jumping through the frozen room over the sharpened blades and the hitman who was jumping from balcony to balcony at the begining of the movie.
Here is a great chase scene from the original B13
http://www.youtube.com/watch?v=_GpOroM0g80
sorry don't know how to embed videos