King was better than Zoro in pure physical strength, yes. Before Zoro got his PU.
Other things? No. Zoro's Lion's Song blitzed him before he moved his pinky. Zoro has landed MANY more direct hits on him than King has landed despite Enma's distraction.
Range and versatility of attacks obviously goes to Zoro with Tatsumaki and his Cannons. Though King has aerial mobility.
And this is without Zoro using Asura.
What extreme diff? Hell, Zoro wasn't even getting curbstomped before PU. He was losing, yes, but he was mostly talking superficial damage and still had plenty.