L4D and L4D2 are so similar I'm not sure I understand how one is muted and the other is too Hollywood. The only real differences between them are a few changes to infected, melee weapons and some additional gameplay mechanics.
E: there's a really cool technical presentation here that goes through some of the technical changes in L4D2 [1]
[1]: http://www.valvesoftware.com/publications/2010/GDC10_ShaderT...