Yeah, I personally don't think Sanji vs King is happening, which means Sanji will high - extreme high diff a YC2 or YC3 this arc.
Meanwhile, Zoro is literally going to show admiral(?+?) level feats on the rooftop in a group battle against two yonko.
So yeah, Zoro vs Sanji will be a kind of pointless debate after Wano, since Zoro's feats will probably outshine Sanji's. The best you'll be able to argue for Sanji is YC1, whereas you will probably be able to argue Zoro and Luffy into low admiral territory.