This are all specualation that why I am saying that we will never agree :cheers:. The only definitive proof is a ZorovsKatakuri in the manga so that all debate are close.
King to me is super super fast, his hybrid form that use a propulsion system make him to me as fast as katakuri but hey, that my opinion.
His defense are not debatable though because we have exactly 1 o 1 situation with the same guy with 2 different result and King is reinforcing that aspect with his speech. King defense are superior to the dragon scales that were hype in all Wano to be extremely strong to the point you need internal destruction damage to really cause arm to Kaido.
So any kind of power in whole cake island didnt use internal destruction thing, nor adv coc which was the key for Zoro to win this fight.
If katakuri has 1 of this 2, maybe I can accept Katakuri winning vs King but right now no way sir