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Roronoa Zoro
"Unarguably an extremely powerful and strong young fighter with immense potential, Zoro is one of the Straw Hat Crew's top three fighters, and his strength is considered so great that, when taking his stern personality into account, people occasionally mistake him as the captain of the Straw Hat Crew after witnessing his skills in battle. While Luffy always fights the strongest enemy, Zoro usually fights the second strongest enemy.
After the two years of intense training with Dracule Mihawk, Zoro has grown much more powerful than before. It is shown during his first appearance after the timeskip that he can cut through extremely large objects with incredible ease, speed, and precision (also considering without the use of his left eye) with only one swing of his sword. Zoro was even able to cut a Pacifista in half with just one slash from his swords, whereas two years prior he barely managed to only slightly damage one." - http://onepiece.wikia.com/wiki/Roron...ies_and_Powers
VS.
Batman
"There are a plethora of superheroes without superpowers but of them all the Batman character relies on "his own scientific knowledge, detective skills, and athletic prowess." In the comic books, Batman is regarded as one of the world's greatest detectives. During Grant Morrison's first storyline in JLA, Superman describes Batman as "the most dangerous man on Earth," able to defeat a team of super-powered aliens all by himself in order to rescue his imprisoned teammates. He is also a master of disguise, often gathering information under the identity of Matches Malone, a notorious gangster. Through intense training, specialized diet, and biofeedback treatments, Batman represented the pinnacle of human physical prowess. His physical attributes exceeded that of any Olympic level athlete that has ever competed. His strength, speed, stamina, agility, reflexes and coordination are at peak human perfection." - http://batman.wikia.com/wiki/Batman_(Bruce_Wayne)