@Blazing Lion
Replying to this:
"I remember you placing WB very high (highest pre MF) in your list and one of the reasons if I am not wrong was his obs haki, countering Ace in sleep. What do you think of Zoro obs haki now? A much bigger attack then Ace's and from a much larger distance away. Would you say that Zoro now has high top tier CoO?"
Yeah, I've always considered healthy old WB as the strongest character pre-TS
And yes, this does raise Zoro's observation haki stocks considerably in my eyes.
I've always thought that Zoro has the best reaction-speed/reflex related (passive) observation haki amongst SHs (Luffy has the best when he actively uses FS). Like, how many times in Wano did Zoro even get caught off guard or got hit without defending himself? Just once really, when Enma acted up and King landed a hit. The rest of the cases were Zoro getting overpowered in clash/defence which is a different story.
What we saw here is just a confirmation of what I've thought before.
Still, no diffing Ace in sleep at close range is a better feat that what Zoro accomplished IMO.
Rookie Ace was back then Jinbe level at least, and his speed/CQC scales there kinda. And WB just one shot in sleep lol.
I would also have to see if Zoro can consistently do it. Because WB consistently clowned on Ace who kept trying sneak attacks.
Anyway, yes. I would put his observation haki at a solid mid top tier. Better than Kaido's and Luffy's when they aren't using FS, but worse then they do.
To reach high top tier in observation haki, IMO you need future sight or some variant of advanced observation haki. (Kaido - FS. Mihawk - clairvoyant. Shanks - FS killer which basically accomplish a similar thing. I'd presume that Roger/WB/Rayleigh/Garp/admirals have some variant of advanced observation haki as well, for admirals it's implied in MF)
must be a hint 
Yuk, Sanji needs his his father's help to be strong, no training involved, he just was born that way
LOL Sanji will never have CoC, a type of haki that you can't train you are only born with it
