While Luffy's Gear 5-enhanced strength is such that he can overpower Kaido with a blow that would have been capable of destroying an entire island, Naruto Uzumaki is more than a match for him by himself.
While using Gear 5th, Luffy is able to extend his elasticity to inanimate objects. Luffy's devil fruit awakening allowed him to beat Kaido, who was considered the "Strongest Creature in the World." In his Gear 5th form, there are not many One Piece characters who can defeat him.
Luffy might be physically stronger and more durable than Naruto because his of the powers his devil fruit gives him, but in a fight Naruto would still win.
While Luffy is notably much stronger in this form thanks to the ability to manipulate his body at whim, Gear Fifth really shines in its increase to his durability.
Naruto Possesses Massive Firepower
In his base form, Naruto is immensely strong. However, when he combines his Six Paths Sage Mode and his Kurama Mode, he is stronger than anything Luffy will ever face. Even if Luffy were to get 10 more Gears, he still wouldn't be strong enough to stand up to Naruto in this mode.
9 Can't Beat: Luffy Has Nothing To Counter Sasuke Uchiha
Aside from his incredible hand-to-hand prowess, Sasuke is a great strategist capable of creating complex battle strategies on the fly, making it very likely he can outsmart Luffy.
5) Jiraiya
He also showed just how powerful he was plenty of times throughout the series, especially through his fight against Pain. However, even the strongest attacks and craftiest tricks in Jiraiya's toad-based arsenal will likely prove ineffective against One Piece's Luffy.
Goku is already a master of many abilities and operates at a much higher level than Luffy at his most powerful. While Luffy's Gear Fifth abilities are indeed impressive, they are not equal to Son Goku's mastery.
While Luffy's Gear 5-enhanced strength is such that he can overpower Kaido with a blow that would have been capable of destroying an entire island, Naruto Uzumaki is more than a match for him by himself.
Luffy is close to Shanks in terms of power and it is only after their fight that he will officially be able to call himself stronger than Shanks.
Sakura Haruno: Sakura's punches would damage Luffy even though he can act as rubber. There's no way he can dodge her brute strength and make out of the fight alive.
Gear 10th Luffy is Luffy's ultimate form from the upcoming speculative fan-made sequel to One Piece, Son of the Pirate King. Luffy has continuously trained his haki and Devil Fruit powers during his time as Pirate King until he achieved this gear.
Naruto lost the majority of his power which stemmed from the nine-tailed beast itself, and consequently, he's much weaker now. Naruto Uzumaki was the Jinchuriki of Kurama, the Nine-Tails, who was sealed in him by his father, Minato Namikaze.
Luffy would win. Kakashi is very skilled, but has strong haki, gear fourth in at least 3 different forms and has a certain sense of unpredictability.
In addition, Luffy still has his standard weakness to cutting attacks.
Roger and his men, as seen during the Oden flashback, would simply be too strong for Luffy to defeat in a fight.
Unfortunately, Luffy's rubber body doesn't make him impervious to fire, so Sasuke is already stronger thanks to his Amaterasu, and his Susanoo's arrows are strong enough to pierce Luffy's body.
Given the evidence, Luffy's IQ could easily be anywhere between 90 and 130.
Frieza is easily capable of defeating Baryon Mode Naruto in base form. Prior to the events of Dragon Ball, Frieza destroyed Planet Vegeta while in his base form.
Since Luffy is now an awakened Zoan devil fruit user, he has grown mightier in strength, moving at a god-like pace and his toughness too has become unbreakable. That is why everyone considers Luffy to be at the peak of his power when using the Gear 5 technique.
5 Weaker: Luffy
Luffy's strength, however, isn't on par with that of an Emperor just yet. To achieve that power, Luffy will have to train his Haki and Devil Fruit powers even further. At the moment, Luffy is weaker than his father, Monkey D. Dragon.
Goku is one of the strongest characters not just in Dragon Ball, but within the entire anime world. Luffy's biggest mistake would be to get on the wrong side of Goku. There isn't any competition and even if Luffy got over a hundred attempts to beat Goku, he would still be unsuccessful.
Sadly enough, Zoro would have trouble fighting Naruto's most powerful Uchiha due to the Sharingan. Madara would avoid Zoro's attacks without even breaking a sweat, ending the fight only with a few hits.
Luffy has the power of Gum-Gum fruit, making him a rubber man. He uses his ability quite creatively and has mastered all 3 forms of Haki. In a fight against Itachi, the current Luffy in his Gear Four is in a totally different class from Itachi. This Fight will be an easy win for Luffy.
MS, EMS, Edo Tensei, Rinnegan and Jinchûriki Madara will win. Luffy simply isn't is his league. EMS or Edo Madara already are even stronger than Kaidô. He has power, experience, intelligence and an insane amount of skills.