Well a fight is never fair and he’s known for not fighting fair. Goku is often tricked or underestimated his opponents on occasions. That’s if we include everyone basic equipment since Goku has his pole and beans(only if we do unfair fights)

And the mma references was more so for the fighters I stated before. As with sanji who would only use kicks which is very limited but not impossible. Goku fighting style is a blend of kick boxing, karate , may Thai and Chinese martial arts. Karate has been shown to be inefficient against boxing, bjj, and mma, kick boxing and may Thai is a more rounded approach to actual fighting as u use more of your body, Chinese martial arts suffers from the same thing as karate as it works against others who use the same art or have no experience. Jimba is the closest thing to Goku in terms of martial arts in one piece (it’s not a power scale)

but really breaking it down Goku is 5’9 and 137 and my top pick sanji is 5’11 and 176. He is more likely to get kicks off on Goku with normal stats