JAIF

Uh, gaiz, sorry to disappoint you but Zabuza has this in the bag.

A normal, strong person wielding a zanbato as big as Zabuza's can cut through an iron bar. Someone as strong as Zabuza would cleave Kimimaro's head off, strengthened bones or not. Sand pressure applied from all directions cannot compare in power to something as thin and sharp as the edge of a zanbato wielded with maximum strength. It's physics, really.

Now, that aside. Zabuza's skills exceed Kimimaro's straigthforward fighting style. First of all, Zabuza was a prominent member of Kirigakure, so he should have all information neccessary on the Kaguya, their strengths, weaknesses etc. Kimimaro was turned into Orochimaru's slave at a very young age, so he should have nothing on Zabuza. The way I see it, Kirigakure no Jutsu would be enough to do the trick. In the mist, Kimimaro would have no way of seeing Zabuza approach before his head was on the ground. So what if Kimimaro had bones protruding all over his body, ready to impale Zabuza as he came close? Zabuza would simply use a Mizu Bunshin, trap Kimimaro in Suirou no Jutsu, and as Kimimaro dispersed the Mizu Bunshin with his bones, the real Zabuza would pop up from behind and cleave Kimimaro's head off.

Curse Seal 1 or 2 only makes so much of a difference. Zabuza wins in all three occasions.

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