Was Luffy able to activate/experience Kenbunshoku Haki in the War of the Best? In Episode 470, Luffy feels as if both his hands got cut by Mihawk's sword. And then immediatly after that, feeling he stopped that attack.

So, is it possible that it was the first time Luffy had experienced/activated the Kenbunshoku Haki?
From the One Piece Wikia article on Kenbunshoku Haki:


  The first time it was seen being used and referred to as Haki was
  during Luffy's battle on Amazon Lily with the Boa Sisters. Later,
  Rayleigh explained Haki to Luffy and confirmed that "Mantra" is the
  Skypiean name for the ability.