If Mifune and Sasuke where to meet and duke it out with only pure Kenjutsu skill only, so no activating the Sharingan, no throwing out some Ninjutsu, tricking 'em with Genjutsu, just pure a pure Sword fight, who would win?
mifune. did sasuke absorb orochi already?. imo mifune wins anyways.. he was pretty much kage lvl, and defeated an edo hanzo, who defeated the younger, but weaker, sennin all at the same time..
Actually, both Nagato and Mifune noted that Hanzo's power was diminished since he became quite rusty during his reign in Amegakure, so Hanzo that fought Sannins seems to be a lot more powerful than his later versions.
Even with this, I'd still give Mifune the edge here since he's a samurai who honed his sword skills during his whole lifetime, while Sasuke didn't devote a lot of time to this compared to the other trainings. Skill wise, Sasuke is at disadvantage here. He's surely able to hold his own against Mifune, but it's almost impossible for him to win against such a sword master relying on his own kenjutsu only.