King and Queen are more like Mr. One and Mr. Two than Kaku and Jabura imo. Additionally, Zoro also faced (and permascarred) your man worth 4.6 B.
Some elements point towards Zoro >= Sanji (bounties, doriki, wings, etc.), others towards Zoro >> Sanji (e.g. all similarities with Luffy). So, putting it all together, it turns out that Zoro is stronger than Sanji by a decent margin, neither too wide nor too small. Adv CoC may have widened the gap though.