I rewatched the 2013 semi recently and it was a lot more error-filled than I remembered it, although the fifth set was amazing.
Wawrinka was awesome in the 2015 final, but Djokovic looked flat for the most part.
I would go with the 2011 semi. Took a master class performance from Fed to bring down that Djoker.
How 2013 Rafa would play against Fed/Wawa from those years is not relavent...he's a nightmare match up for both of them especially on clay. Not so with Djokovic, if anything it's the other way around.