Why King, why do you want King i showed you someone using Hardening on his black clothes and i showed King using Hardening on his sword but you are still insisting on King using Hardening on his clothes.
Sanji is called using Armanent not Hardening and if you want to talk about anime go to anime corner. I am saying he just didnt used it on screen.
Yes you have that but we have so many panels of Oda foreshadowing Zoro's haki. Even Brook jokingly teased us about CoC before the reveal Sanji does not have the same thing.
You are just talking about Zoro and Sanji's reactions. But at that time neither of them knew they had CoC so that doesnt count.
That same thing I am telling you why it is same on Sanji. We can't see King using Haki on his body, but does that mean he isn't using Haki? Why you putting Sanji isn't using Hardening when many times even in Anime shown he can use it even in same scenes. If Oda thought he isn't using it, he would tell anime to not put Hardening on him, but they still do it even now. No logic there.
Yeah same thing on Sanji having COC on him too in different traits and Haki is shown in this one about him having it as effect on his Iffrit Jamble too.
They gotten hints on that ever since that arc though, so not to underestimate that where you checking on the series.