Sanji obviously used haki, he used haki multiple times this arc on many occasions. He was afraid of hurting Black Maria if he used haki to protect himself. There is no good reason to not use it, especially cuz he tanked the attack pretty well, obviously the Raid Suit helped him to absorb the damage but there is no proof of the Raid Suit being so resistant during Whole Cake. It's Sanji the one that is built different
Keep ur headcanons to urself .
• Zoan form King vs Base Sanji :
I would die with a hole in my belly , Sanji dies without suit .
• Zoan form King vs RS Sanji :
he was absent for a while where big mom was fighting and then got sent out .
Thanks god for this suit and he panted afterwards .
• Zoan form Queen vs Base Sanji :
I'm gonna use hybrid form
