Did Hans Zimmer pull inspiration for the infamous "Why So Serious" track in The Dark Knight from Francis Lai's score from the 1983 musical Edith Et Marcel? Take a listen to both and decide for yourself! [Thanks Jerome!]
Hans Zimmer is "influenced" (read: rips off) a lot of other composers' work. Check out the comparisons between Holst's Mars and Zimmer's Gladiator Waltz:
Gladiator Waltz: [www.youtube.com]
Also themes used in The Battle (which he was sued over): [www.youtube.com] Skip to 1:45 ish and listen to the strings and the rhythms in particular.
His work is becoming as derivative as Danny Elfman (who I love anyway). It's always that same bombastic, punch driven sound. Listen to Pirates, Gladiator, etc. In The Battle, skip to 5:53, it sounds exactly like Pirates of the Caribbean as pointed out in the comments.