You say that and completely ignore Mihawks feats. Shanks input some effort and it took the combined work of both Newgate and Shanks to split the sky. Mihawk performed his feat on his own. Neg diff speed blitzing G2 Luffy is a very impressive feat. And actually Shanks stopped Akainu at the same time as his ship arrived ; he clearly jumped off , he didn't run several miles or whatever you seem to be implying.-Skill with sword: Mihawk > Shanks
-Speed: Shanks stopped Akainu before his ship arrived, so he has some crazy speed. Shank > Mihawk IMO
-Strenght: Mihawk plits a tsunami, Shanks plits the sky (and yes I know WB was also involved). Shanks >Mihawk IMO
-Haki: from feats it is easily Shanks > Mihawk, but Mihawk will probably have great Haki too, we just dont know.
-Stamina: We have no clue, but both of them will probably have INSANE stamina and durability.
Thats why I think Shanks > Mihawk.