Also, he might be able to pinpoint queen’s location if he notice even a minor detail.

Kept up is putting it a bit highly, from what I can recall there wasn't a scene where a Flames Off King was going sword to sword with Zoro. From what I can recall he vanished from sight whenever he used it, slowed down, turned his flames on and attacked.

We also know King couldn't sense invisibility as showcased with Stealth Black which used the same Germa Tech. Queen also couldn't sense Sanji when he was invisible meaning neither King and Queens observation Haki was high enough. And since Zoro traded blows King could react to and vice versa(Flames On at least) it appears their Observation Hall are somewhere around the same league. Because if not Zoro would be dodging a lot more than he was as he would've had a much greater CoO.

Personally I see the fight going something like this, Zoro and Queen spawn, Queen fires a Lazer which Zoro effortlessly slices in half, Zoro gets his swords out and Queen readies himself. Zoro hits him at least taking out the equivalent of half his HP in his Hybrid Mode sending Queen into a panic. Queen turns full Zoan and starts fiering himself as a snake which catches Zoro offguard since who expects that. Zoro like he did with Kings explosion covers himself in Armement but quickly finds it isn't helping, he uses his mouth sword which is free and cuts at Queen which cases Queen to back off. Queen turns invisible. This leaves Zoro somewhat hurt and Queen borderline out already. Queen fires attacks from all angles whilst invisible as Zoro, unable to track things, has problems defending, but Zoro eventually catches Queen using where a Lazer came from knowing they move in straight lines and after having taken a lot of damage getting to this point finishes Queen off with an Onigiri.

He'll take some damage because Queen fights in an odd way and Queen has some Hax Zoro can't instantly get past but the second Zoro lands a couple of hits Queen is out.

^Not a bad explanation... most here would say "Zoro blitzes and win". I'm glad not everybody here thinks Zoro can one-shot everybody

He could probably take Queen out in like 3 or so hits adnitably, scarring Kaido pre ACoC is a massive thing, and I don't think Queen has the durability or endurance to tank more than a couple of hits. If he didn't have invisibility this fight would be way shorter and Queen would be landing like no hits after the snake one. And even the snake one is just landing because I don't think anybody can respond well to that one on the first time seeing it. Invisibility is carrying Queen to a high diff here, Zoro's AP is intense. I've been doing a lot of research for my Zoro Vs Sanji post that'll be posted, when it's done, I'm trying to be very thorough.

I mean in theory if Zoro decided to take it seriously he probably could oneshot with Nine Sword Style or any of his ultimate techniques like Shishi Sonson or Three Thousand Worlds.

Obviously he wouldn’t do that, but it is technically possible.

Overall I say low-mid diff because from what I remember, Zoro has massively higher AP, better defense, is faster, and can cut his way out of the snake thing anyway, like he did with the chimney in Water 7.

@Marcus Mattson the attack that scarred Kaido had ACoC, that’s why Kaido mentioned that Zoro had CoC after it.

Zoro doesn't blitz and one shot. Manga Queen wasn't a threat outside of his squeeze. He never felt like a threat like King. If Sanji wasn't worried about his body changing he could've defeated Queen even easier. Zoro would low-mid diff Queen imo. Queen was not portrayed as a fighter, he used science and biological weapons

I think it'd be low to mid diff if it weren't for his invisibility dragging the fight out and letting Queen land more hits than he should get away with otherwise

Queen is the weakest of the "All-Stars", with Jack being stronger. He is a threat mainly due to his intelligence, using it to make things like diseases.

IMO, he mid diffs him. Ifrit Jambe Sanji annihlated him, and it looked like Queen couldn't even fight back. Same would go for Zoro, except instead of Overwhelming Speed and Still pretty damn good power, Zoro would be attacking with Overwhelming Power and still pretty damn good speed.