Unless Mihawk does nothing from not until the EoS it makes no narrative sense for Zoro vs Mihawk to happen.
Like some have mentioned most tension had been lost when Zoro became a student of Mihawk there's no conflict, no emotion and I don't think either would be able to go all out on one another.
Mihawk dying before Zoro vs Mihawk makes much more sense from a narrative sense even if Zoro vs Mihawk would look cool.