I never wanked King. I always said he was a bit stronger than that other thing, but nothing more. Sanji vs King wasn't a matter of strength to me, King was perfect as Sanji's Katakuri.
It was like expecting Zoro to fight the only guy with a sword in an enemy organisation. Of course i expected the guy with two pairs of wings and that used fire to fight Sanji, especially with Zoro on the roof