Oda pretty much tells you where Mihawk stands when he admitted inferiority to sickbeard, heck WB knows Mihawk yet he isn't worried about him at all facing one of his commanders.
Mihawk never stated he's inferior to WB. If that was the case he would have stated he's weaker but he didn't. He was testing to see if it would be easy to hit WB since he is no longer hiding out in his territory. He is now out in the open. The manga showed us it's not easy to hit a Yonko when when he has his YC protecting him. WB has 16 YC.
Diamond Jozu, the WB pirate with the strongest defense protected him, not Vista.
WB, who remembers Shanks and Mihawks battles like they just occurred because of how legendary they were, wasn't worried Mihawk because Mihawk wasn't going after his head. He didn't even use a name or haki attack. Oda showed us twice how little Mihawk cares about this war. First the fleet admiral was surprised he showed up to the meeting. Second, Doffy was surprised he was attacking. Luffy was the only thing he found interesting about the war. The fact the fleet admiral was surprised Mihawk showed up to their mandatory meeting shows how little they can control Mihawk because of how powerful he is.
If you are gonna bring outside material then here is Vista's.
Yes, the famous Vista post Mihawk haters love posting yet fail to comprehend.
The databook tells us Vista showed swordsmanship skills comparable to Mihawk's in their fight. Translation, Vista swordsmanship is comparable to Mihawk's when he's not focusing on his opponent instead thinking about something else while fighting. That's nothing to be proud of but it's not that bad either when you consider the fact Mihawk id the only one capable of doing that. Neither Kaido nor Luffy who both have FS have showed the power to easily fight a YC level character while not focusing on their opponent.