[ClosureSpin]

Nope. Scala allows for and promotes for functional programming with higher order functions all over the place, its more powerful type system, immutability, practices, standard library, and much more.

Having lambdas makes you about as functional as C++ these days.

Functional/non-functional is a fuzzy distinction but C# is definitely not a functional language.

[seanmcdirmid]

There be no true Scottsmen here. Scala is also great as an imperative language and an OO language. In fact, I would say Scala has one of the most powerful natively supported object systems out there (mostly because the rest of the statically typed language world can't be bothered to support mixins, grr...).

If it wasn't for nerfed imperative collection classes (to encourage functional solutions) in the standard library, you could totally just ignore the fact that Scala was a functional language at all; it is not in your face about it like Haskell.

It would probably be more correct to say that "Scala is the only language that does both FP and OOP very well." On marrying the paradigms....why not just use both as needed anyways? That is completely doable in C# as well, just not as well as in Scala.