kizaru would win rather easily
Any of the Admirals could still solo the SH's. Just because they have Haki doesn't mean they're bypassing their intangibility so easily, we saw that with Akainu in the war when even someone like Vista attacked him. Hell even Blackbeards entire crew didn't want to fuck around with Akainu, and Blackbeard had the Gura Gura no mi and an entire crew of badass prisoners from level 6 in impel down including the biggest creature to ever exist.
EDIT: Think about this too, the Admirals not only have their insane logia, but they're monsters physically, and should be masters of haki higher than that of even Luffy, probably know all the forms of Rokushiki too, you saw when Aokiji leapt like what, 200 feet in the air to freeze the tsunami's whitebeard brought? Yeah pretty crazy