Black Leg Sanji

Diable Jambe

I will start this section by going through some early and late Diable Jambe feats from Sanji to establish/set up how strong his current Ifrit is, Starting with some early Diable Jambe feat, Sanji was able to make Jabra's tekkai useless with a single diable jambe kick and even burning him all the way to his bones, Jabra's Tekkai was capable of blocking a slash from Zoro with his hand, And an exhausted Zoro from previous arc easily cleaved through a beanstalk that no-sold an Island falling on it:

Gallery

During Thriller Bark, Sanji was able to completely overpower a bazooka from Oars, Oars who was known for his nickname "The continent puller" and was actually pulling countries and piecing them together. Entering Post-timeskip Sanji showed higher potency of his Diable Jambe flames as he was able to only ignited his flame but also burn the Surune to crisp while being near 30,000 feet underwater.