Kas'im vs. Exar Kun (Lightsabers only)

The greatest duelist in the Galaxy vs. Ancient Sith lord

Who wins

Duel takes place on neutral ground

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Kas'im has Jar Kai sabers/his saberstaff
Exar has a single blade/saberstaff

Don't be a moron.

KJA confirmed that Exar Kun is on a "firmly lower tier" than Palpatine. Palpatine fights in RotS and clearly isn't hypersonic. Bane even as of PoD can explicitly move faster than the eye can see (vs. Sirak). But Bane after defeating Sirak admits that he's no match for Kas'im. Kas'im >>>> trainee Bane >>>>>>>>>>>>>>>>>> Palpatine > Exar Kun.

Except neither of these are the greatest duelists in the galaxy.

Spoiler:
Neither is Dooku

Kas'im was the greatest duelist in the galaxy in his time, Kun was the greatest in his time.

Kun wins anyway.