Roof Piece had me unsure, but after seeing the portrayal of these two since 1010, I think it's safe to say Zoro and Sanji are still relatively close in strength
Whenever Zoro and Luffy do a combined attack, the first thing you hear is "omg they're totally equals!!" Lmao
Zoro is obviously the 2nd strongest (and that will NOT change), but the gap will never be as large as some would like it to be. Especially if they 2v2 their opponents.