So when do we get Zoro vs Sanji? This arc? The next? Oda has planted the seeds in Wano. Now with Sanjis eyebrow changing and him speaking about execution I clearly can see a case of Zoro having to straighten Sanji out sooner or later. But my oh my, that's a big problem for Zoro. His attacks are too lethal and he doesn't want to kill Sanji so how does he take him down while holding back? He isn't that many levels ahead of Sanji that he can casually knock him out with the back of the blade like he does against fodder so he will need to assert himself with CoC-infused attacks to break Sanji down without maiming him for life.
Green Bull, Aokiji, Kidd, Doflamingo, Crocodile have much better skill sets for capturing people. Zoros is amongst the worst out there in that aspect.