King looking like a beast and the fight against Zoro will only elevate that.
• Durability, endurance and all the traits of ancient zoans fruit.
• Abilities derived from his race, related to fire. He conjured a fire ball that Marco stopped using the same technique he used to stop Kizaru's Yasakani.
• Clealry has the offensive power. When we see everything he can do (including his swordmanship techniques and special race techniques), it will be nothing short of amazing.
• Hasn't shown his hybrid form and will give a fight to a monstrosity like Zoro.
He is not close to emperor/admiral level or absurdities like that but he is strong as shit.
King > Katakuri.