Actually, that would probably be pretty boring--the two languages overlap considerably. I worked at an OCaml company this summer; coming from Haskell, I picked the basics up immediately and only took a bit more time to learn some of the more advanced features (e.g. OCaml functors).
I had some discussions about OCaml vs Haskell and, honestly, nobody could come up with a particularly strong case in either direction. (That said, we didn't do anything using multiple cores where Haskell has a bit of an advantage, I believe.) It always came down as "well, Haskell is awesome, but we're already using OCaml and it's pretty awesome too, and maybe easier to learn".
Much more interesting would be Haskell/OCaml vs everybody else, but that gets played out all the time anyhow :P.
I had some discussions about OCaml vs Haskell and, honestly, nobody could come up with a particularly strong case in either direction. (That said, we didn't do anything using multiple cores where Haskell has a bit of an advantage, I believe.) It always came down as "well, Haskell is awesome, but we're already using OCaml and it's pretty awesome too, and maybe easier to learn".
Much more interesting would be Haskell/OCaml vs everybody else, but that gets played out all the time anyhow :P.