I'm asking this question because most of the logia users in the series intentionally didn't dodge attacks that were pointed at them by non-haki users.
But if they actually were haki users a lot of logia users would be badly injured or even dead.
For example, luffy versus aokiji luffy kicked and scattered aokiji to pieces but aokiji wasn't harmed at all. But if luffy had haki and hit aokiji with it so the fight would be diffrent. Luffy wouldn't be able to defeat him at that time even if he had haki though.
But aokiji must have known that luffy can't use haki.
So he couldn't sense any haki and that's why he didn't dodge?