haki sanji

Haki

It was stated by Luffy that Sanji possesses Haki, when discussing it in the context of members of his crew who could fight Caesar Clown, a Logia user. However, Sanji did not actively display any of these abilities until Punk Hazard when searching for Kinemon's body using Kenbunshoku Haki.

Kenbunshoku Haki

When helping Kinemon recover his torso from within the lake on Punk Hazard, Sanji actively used Kenbunshoku Haki in order to locate the samurai's torso within the dark water.

Diable Jambe

Sanji using Diable Jambe.

In the Enies Lobby Arc, Sanji reveals a new ability - Diable Jambe, the power to heat his lower legs to a temperature so high that they glow bright red, by spinning rapidly in place, which causes his attack to be more powerful. "Diable" means "Devil" in French and it's also a type of dish. "Jambe" means "Leg", but the kanji reads Diable's Wind. The aforementioned attacks also have the word Diable Jambe preceding it (ex. Diable Jambe: Flambage Shot). The heat of his attacks is so high that contact for even a second could set a person ablaze. Sanji used this ability during his fight with Jabra, in which his normal attacks weren't so effective due to his active usage of Tekkai. But with the heat of his new ability, Sanji easily overcame his inability to smash through Tekkai by burning through it instead. And by using the technique "Frit Assorti" in Diable Jambe against Oars, Sanji was able to effectively deflect his direct Gomu Gomu no Bazooka in order to protect Robin with a single kick. Also revealed during the crew's battle against a Pacifista, it appears that Diable Jambe puts extreme stress upon Sanji's legs. After several uses of the technique, Sanji himself comments that if he were to use the attack one more time, his legs would break. It is unclear at this point in time whether it is Diable Jambe itself that puts stress on his legs, or the strain of kicking the extremely durable Pacifista cyborgs repeatedly.^[8] After his two-year experience in "hell", Sanji becomes strong enough to break the neck of a Pacifista with only a kick, critically damaging it, and not showing any trouble.
His tolerance against fire is also astonishing, which would make sense since he is a cook. This would explain why he is able to utilize Diable Jambe without showing any signs of getting burned himself while the opponent gets incinerated at the receiving end. However, Oda has said that it does not damage him because while the Diable Jambe burns hot, Sanji's heart burns hotter.
After the timeskip, Sanji has gotten considerably stronger and his attacks are more powerful, as seen in his fight with a Pacifista. Before the timeskip, Sanji could only kick a Pacifista once, because another kick would break his leg, and still, it did not do much damage. After the two years of training in "hell", he can critically damage a Pacifista with a single kick, which is strong enough to break its neck; with the Diable Jambe improving to the point that his entire leg is enveloped in large flames. In addition, Sanji has also gained incredible speed, even underwater. Usopp states that Sanji's speed is on par with a fishman, who are at their physical prime under water. His Diable Jambe is now so powerful and hot that even under water, it is able to scorch one of the Kraken's tentacles, severely injuring it. His overall endurance has also increased, as he was seen being able to take direct punches from Jinbe and Luffy, from both sides simultaneously, and yet still remain conscious, albeit bleeding on the ground. He also developed a technique similar to that of CP9's, where he is able to walk on air (Sky Walk) making it look like he was actually flying. Whether or not his proficiency with the technique is on par with other CP9's members still remains a mystery. As he was airborne he executed a new move called, Frying Pan: Spectrum where he stomped his opponents repeatedly with high accuracy and speed, much to the amusement of Luffy and the others.