Sanji vs Queen
Queen is the perfect opponent for Sanji this arc.
With the exception of Kuroobi, Sanji's opponents are never the 100% serious type the way King is.
Mr2, Jabra, Absalom and even Wadatsumi, all are quirky characters with various running gags.
Queen is the character who sent the Flying Six after Sanji in the flower Capital before even knowing his identity, the one who singles out Sanji from the rest of the SH's based on his high bounty after talking about eliminating the top members of the SH crew and recognizes his family name, talking about Judge and hinting at him having a connection to Sanji's father that will be explored by the end of this arc.
He mirrors Sanji in certain aspects, with them both being blondes, smokers, shown to be love struck by Hiyori as well as mourning her death, have had the most extended plot interaction with Big Mom from both crews, and if his "Sumo Inferno" game and the wrestling move he pulled on Big Mom are anything to go by, Queen could also be revealed as a Kenpo user, and the strongest martial artist from Kaido's crew.
Also Queen and Sanji are both technology users, but currently at opposite ends of that spectrum contrasting each other in that regard.
Queen is someone who embraces technology to such an extent that he has modified his body to the point where he can pull an Inspector Gadget and strech out his neck like crazy, while Sanji just received a technology based power up going into Wano, and is still reluctant in relying on technology in combat.
Also Queen is someone who has modified the inside of his body like crazy, becoming a full on cyborg, while Sanji goes the different route wearing a power suit instead.