Zabuza almost killed Kakashi so this thread is pointless.
Okay now why do you underestimate Zabuza? His taijutsu + sillent killing + mist is a pretty deadly combo, not easy to deal with, it totally fodderizes sharingan, so don't be like Zabuza almost killed him because a lot of strong shinobis would lose against him.
Anyways, with war arc feats, Kakashi showed he can keep up with 4 v2 jins by his own with no help and speedblitz them. (Gai was fighting the 5 tails, Bee was fighting the 4 tails and Naruto was inside the 4 tails).
V2 jins are so fast that 2 of them put KM Naruto to shame, War arc kakashi's speed and reflexes > Sasukes. So
Speed: Kakashi >= Sasuke
Reflexes: Kakashi > Sasuke
Taijutsu/CQC : Kakashi < Sasuke (sasuke has the sword here, that's a big advantage)
Ninjutsu: Kakashi >=< Sasuke (depends on the situation, kakashi is more versatile here while sasuke has more raw power)
Summonings: Not important here, Kakashi totally kills manda with raiden, while Kakashi's dogs also get fodderized
Intelligence and clone feints: Kakashi >>> Sasuke
So if you put this all together on a fight, Kakashi would be the winner, high diff