Please. The difference in terseness and clarity is made up almost entirely of the lenths of the symbol names:

template<class I, class C> void sort(I a, I b, C cmp);

Now, the concepts aren't 1:1; Haskell for obvious reasons doesn't represent the idea of operating on storage directly, so you can't have an iterator and need to return a "new" list. C++ makes you write out the types you are parametrizing instead of getting it implicitly. And there are no doubt some really good arguments why Haskell is terser and clearer than C++.

But this isn't one of them. Come on.