@Xulrev - Zoro used haki on an air-slash when he cut Monet's cheek, who at the time was biting into Tashigi. However, idk about Smoker using Haki on his smoke (I don't think that happened unless i'm mistaken). But Luffy is capable of harmonizing his paramecia body with his Haki using Gear 4th, so it can be suggested others can implement Haki w/ Paramecia abilities (Not necessarily saying Fujitora can, but it's possible).
@Damage - The issue is that Sabo did not turn into fire upon being hit by Raging Tiger. We see him affected in 2 panels before he turns into fire to move towards Fuji. So yes, Sabo was certainly affected despite being a Logia.
- Also, Fujitora blocking a kick from a fire-man, unless Sabo materialized his foot for no reason other than to make his attack blockable.
Also, irrelevant side-note, but it seems Luffy actually did better than Sabo against Fujitora overall, from what's seen at least.
BTW, it's really hard to confirm if a user of Haki is using Armament if they are not using Koka, because cases like Sanji being stated using it against Judge were... just the normal invisible application. Fuji certainly used Haki vs Sabo since he actually damaged him, as seen here.
And note how Luffy's got bruises in the fight. A sword didn't do that. Either Fuji was using Haki in their fight or he's just strong enough to bypass Luffy's dura physically (yet unable to w/ DF), either way, supports Fuji's physical AP scaling to his DF, seeing as how he has hurt characters with physical attacks, the same 2 characters who tanked his Raging Tiger