I'm kinda happy. I prefer Sommers for now as a character, he is just too funny. But Killingham can be interesting too because we really don't know him that much and can be developed through a fight.
By the way as long Sanji gets a fight I'm either ok with him fighting Killingham or Sommers even if, like I said, I would have preferred the latter.
I just want to see Sanji unlock Supreme King Haki, that's it. But who knows if this a set up for a real fight or not. Just remember what happened with Kizaru.