Sanji, the Straw Hat Pirates' chef, is becoming stronger through the Straw Hat Pirates' journey across the seas. one piece A new world. He has always been incredibly efficient when it comes to combat, and now that the Straw Hats face serious danger in the New World, especially in the Final Saga, he has to strengthen himself even further.
By the end of the story, the Straw Hat Pirates have risen to the level of the Emperor's crew. This means that Luffy's subordinates, such as Sanji and Zoro, must also reach the next level of power. So Sanji had to outsmart many powerful pirates, and some elites were already left in the dust by him.
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Vinsmoke siblings
The Vinsmoke Siblings are Sanji's brothers, and this character was introduced to fans in the Whole Cake Island Arc. There, the brothers are revealed to be absolute war machines capable of bringing down a nation on their own.
The Vinsmoke Siblings had everything Sanji didn't. An exoskeleton, a cold heart, and a body that can handle just about anyone. However, Sanji had one thing that they did not have: emotions and free will.
The Vinsmoke siblings were very strong, and by the time of the Whole Cake Island arc, some, such as Niji and Ichiji, may have been stronger than Sanji. Not so in Final Saga. Sanji has officially already surpassed them all, and has since reached unprecedented levels of power.
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Don Quixote Doflamingo
Known as the captain of the Don Quixote Pirates, Doflamingo was a monstrous and powerful figure that fans saw quite a bit of in the Dressrosa Saga. one piece. At the time, Doflamingo was Luffy's rival.
However, Sanji scuffled with him when the two met not far from Green Bit. Doflamingo was able to completely subdue Sanji, despite acknowledging his immense power at the time. Sanji was overall much weaker than Doflamingo. However, now in the Final Saga, Sanji has become strong enough to easily defeat him without using all his strength.
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king
Wildfire King, whose real name is Alver, was one of the three all-stars of the Beast Pirates. King had the highest bounty of them all, and considering that the Water Pirates were a meritocracy, King was believed to be Kaido's most powerful subordinate. He was incredibly tough, and his fight with Zoro proved that King was not an easy opponent to deal with. Sanji battled King on several occasions, and each time he was able to hold his own, suggesting that there wasn't much difference in terms of strength and skill between the two to begin with.
However, when Sanji awakened and unleashed his potential power, he reached a level that far surpassed the King. Now, Sanji has enough power to easily beat King in battle without going all out.

One Piece Confirms Zoro's Perfect Devil Fruit Power Formula
One Piece author Eiichiro Oda has officially lined up the perfect Devil Fruit for Roronoa Zoro.
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Charlotte Katakuri
Charlotte Katakuri is the strongest of the Sweet Commanders of the Big Mom Pirates. Known as an incredibly powerful pirate with the ability to see the future itself, Katakuri is superior to Sanji in terms of the use of observational Haki. But overall, as a fighter, Sanji far surpasses him in all aspects of combat.
After Sanji awakened his latent power, he reached a much higher level than the first Yonko commanders. Only a few individuals can face and beat him in combat, and Katakuri is certainly not one of them. Since both men are excellent at using Observation Haki, a fight between these two would be very enjoyable for fans to witness.
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Marco
Marco, known as the former captain of the 1st Division of the Whitebeard Pirates, is a very powerful pirate, and his power is recognized even by the Five Elders. In the Paramount War arc, Marco proved himself strong enough to take on the Marine Admiral and give him a run for his money.
Marco is an incredibly powerful character, and the power of his Phoenix Devil Fruit allows him to recover from any injury as long as he has enough stamina. It's definitely debatable as to who is stronger between Marco and Sanji, but the latter possesses incredible strength along with a very high recovery rate. Furthermore, the offensive power he possesses far exceeds Marco's arsenal, and the fact that he can destroy and shock even Kizaru's Light, something even Marco could not do, clearly suggests that Sanji is far more impressive than Marco.
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