User blog comment:Neowitch/700 - Breakfast at Mugiwara's/@comment-1454981-20130227135301/@comment-4754162-20130228035934

Post TS, the impression that I've got was that DF makes one powerful, DF with haki makes one a monster (which I think WB is in this class) but one with haki mastery alone (no DF whatsoever) can outmatch a monster having DF with haki makes him legendary. Rayleigh gives me that impression for being able to go on par (might I add quite easily despite his age) with Kizaru the admiral who should have had a good level of haki. Roger got the legendary state and branded Pirate King, hence is what impression I got about Roger only has haki mastery + something else but definitely not DF related.

If he had DF, then his hype will be lesser than not having DF at all. Not sure about others but that's my feel.