Out of all the swordsmen he has encountered Mihawk is clearly the strongest.
The only other swordsman Zoro has admitted is a level beyond him at the moment is Oden because he realized how skilled with haki he must have been to wield Enma like nothing.
Fujitora downplayed his abilities a lot vs Zoro and Sabo so it wasnt much to go by but Zoro correctly understood he was an admiral before anyone else noticed so he clearly sensed an overall power level.
Nusjuro was mostly off screened so that is up in the air.
Amongst non swordsmen he was impressed by Kaido and Big Mom, especially Kaido. And he holds Luffy in the highest regard.
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Shiki who fought Prime Garp and Prime Sengoku for sometime, is weaker than Shanks?,
Shanks has the attention of Akainu, Green Bull, WB, Gorosei, Mihawk, Kaido, Roger, Sengoku and BB. Until proven otherwise he is to be considered God Level with a select few others. Feat and hype is sick.
Shiki was at best around Big Mom level. I’d wager a bit stronger than young Big Mom and a lot stronger than Kaido but still same tier. Same as King > Queen >> Jack. WB on a level above, Xebex 2 levels above.
Xebec
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WB
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Shiki
Big Mom
Young Kaido