Sanji in Alabasta arc, Mashiro in current Bleach(Even though she hasn't appeared since FKT). Sanji is willing to hit Mashiro.
Feats for Sanji- Building buster from what I remember, and great speed feats,too. Filler feats count in this fight, as long as they take place before Alabasta.
Feats for Mashiro- Small building buster, can maintain a mask that greatly increases power for 15 hours,can use Shunpo/Sonido,Cero,etc.