Luffy and Zoro, especially the latter have done much better than expected, pulling off some insane feats that were previously considered impossible.
Most people would say Sanji can't beat King but just like with Luffy and Zoro, Oda may surprise us and give Sanji feats against a YC1 opponent.
That doesn't mean Sanji will 1v1 King. I can see situation where it's Sanji and Marco vs King, with Sanji finishing the fight and beating King at the end.
Sanji having feats against a YC1 doesn't break the power dynamics among the SHs now that we see how strong Luffy and Zoro are vs Yonko.
Queen is still a good possibility for Sanji due to the Germa link, but I don't think we should discount Sanji being able to do significant damage to King as Oda may once against surprise us.
Most people would say Sanji can't beat King but just like with Luffy and Zoro, Oda may surprise us and give Sanji feats against a YC1 opponent.
That doesn't mean Sanji will 1v1 King. I can see situation where it's Sanji and Marco vs King, with Sanji finishing the fight and beating King at the end.
Sanji having feats against a YC1 doesn't break the power dynamics among the SHs now that we see how strong Luffy and Zoro are vs Yonko.
Queen is still a good possibility for Sanji due to the Germa link, but I don't think we should discount Sanji being able to do significant damage to King as Oda may once against surprise us.