User blog comment:Juraquille Mihawk/Hawk-Eye Haki/@comment-3472272-20110309171120/@comment-3326484-20110309232918

Rayleigh told Luffy that every one has the potential to use regular haki. I would not be at all surprised if Hawk Eye had excellent haki control. Otherwise, how would have he competed with Shank's Haki imbued attacks.