Unfortunately Oda never gave a clear island level feat to Sanji. Someone like Zoro cutting Pica in half, Luffy punching Doflamingo and destroying in half Dressrosa, Sai destroying in half dressrosa hill, Coby/Garp destroying Pizzarro island form.
While Sanji demonstrated repeatedly that he has super human strength that is sure comparable to the few characters that I already mentioned, still we never saw something like their feats. Sure Sanji is capable of doing it, but Oda seems like to never took a chance.
Maybe we will something in Elbaph where everyhing is huge. I hope it, a clear feat like that will shut down a lot of non believers.
Sanji kicking Queen massive body to the sky is an huge feat showcasing his raw power, unfortunately it is not "spectacular" or "flashy" like the ones I already mentioned, so Sanji get the title of character who "lacks attack power" which is clearly false.