If this post is not a cover for justifying “Zoro’s CoO is better than Sanji’s”, I am inclined to talk about the facts.
Zoro, while not confirmed but with all signs being there, most probably used CoO and CoA against Mr. 1 during Alabasta.
Sanji’s pervert sense is also shown to be a branch of CoO specialized for him, so he probably used it during Little Garden too.
As for cursed sword things, I cannot decide honestly. I think cursed swords have their own personality and Zoro might have used CoO in that case to sense its presence, but there might also be something more tricky about them too. I would say chances are %60 CoO and %40 not CoO
Zoro, while not confirmed but with all signs being there, most probably used CoO and CoA against Mr. 1 during Alabasta.
Sanji’s pervert sense is also shown to be a branch of CoO specialized for him, so he probably used it during Little Garden too.
As for cursed sword things, I cannot decide honestly. I think cursed swords have their own personality and Zoro might have used CoO in that case to sense its presence, but there might also be something more tricky about them too. I would say chances are %60 CoO and %40 not CoO