In terms of speed? Erlang's not even in the ballpark that C is in. I'm pretty sure Haskell significantly outperforms Erlang as well.
http://shootout.alioth.debian.org/u32/which-programming-lang...
http://shootout.alioth.debian.org/u32/which-programming-lang...
I am not sure about Haskell, but, from my limited experience, Erlang runs at levels very close to C (my C, at least)