Nah. It was due to Luffy's inability to deal with the Haki based attacks and defenses by those sisters that caused him to fare so poorly against them. If the sisters hadn't had those Haki skills or Luffy also had had them, the battle would have been over in five seconds. I suppose at this point it could be said that a newbie Haki user is more powerful than a skilled veteran without Haki skills. Different power scales.