Just had to check. Nice picture ._.
We still know nothing about Mihawk since he was just fucking around until this point he cut a giant ice-tsunami with a casual slash just imagine what he can do with a serious slash and then a serious slash with haki added,an also about the speed Mihawk should be as fast as Madara and should have Obsevesion Haki and he might have the strongest Obsevation Haki since is known as Hawk-Eyes .
If is Sage Madara i would say that he wins with Mid-High Difficulty and if is Post-Rinne Tensei Madra he gets stomped R1 and he loses but puts up a fight in R2
@FormerCrimsonKing: Against Naruto characters he could easy overwhelm them but against a One Piece top tier it will not be so easy ,for example Law had cut multiple mountains and he is a high-mid tier ,Shiki a top tier can easily levitate islands this feat is on par Chibaku Tensei if you ask me also Haki is still a mistery we only know what basic abilities can do we don't know the full extent yet