Sanji is a monster just like Zoro. What I don't like is people using him being a cook to diminishing his monster power. Luffy acknowledges it. And yes, Sanji is as strong as Zoro. Fans of Zoro fear this and I don't understand why only to think they are very insecure that a cook can be on his level.
And again with the obsession of Sanji being comparable to Zoro, why can't he just be strong without lumping him with his superior, is it that hard?