I own them both, and for sports or action, the 70-200 is epic greatness. But for those images of the kids and you want not to document, but creat, the 85 is WAY better.
I had 70-200, sold to get the 85, sold the 85 to get the new 70-200, missed it too much, and sacrificed the 14 L II for the new 70-200 to have both. Different area of use, and one doesn in no way replace the other.