User blog comment:AYET/Talk about chapter 716 and episode 604/@comment-6920514-20130731215558/@comment-5962458-20130801094002

Funny you should say this. I believe we have seen it used between two bigshots before but due to this wiki's "obvious confirmation policy" no one has accepted it. I am positive that Shanks used it against Akainu when he blocked his punch aiming for Coby. The small pannel of Coby fainting immidiately with foam coming out of his mouth is as confirmation as it gets as far as i am concerned.

About the Luffy-Chinjao clash i can see them using buso koka alright but we don't know for a fact that they were also using HH. It could be that Diamante knew for a fact they both are capable of using HH and so he made that comment.