Can Zoro Use Observation Haki. Starting from 40. In Wano Country fans got to know of his potential to use Conquerors Haki as well.
Conquerors haki is a utility practically. Sort of like how Zoro is able to sense where his swords are maybe it works or could the same way where if an objectitem has your haki you can sense and locate where it is. As of now this power has laid dormant within Zoro and he is unaware he possesses it.
However zoro is also using a variant of it if we conclude that him using anything demon related comes from his usage of kings haki.
I agree due to matchups Sanji could possibly beat Law but Zoro might not be able to. Zoro use Observation Haki to find Pica Reaction Mashup. It could also be some sort of near death power up in which he relied on pure instinct. If playback doesnt begin shortly try restarting your device.