Quote Originally Posted by Sidnne
The Sharingan could and did see the that water clones weren't real against Zabuza. Kakashi copied the water clone jutsu and made his own, which he used to attack Zabuza's water clone. He didn't attack the water clone with his actual person.

And vs Itachi, it wasn't a clone. It was more of a disguise, so I don't think that counts.
No.....

Kakashi copied the water clone jutsu because he saw zabuza performing the water clone jutsu, but he can't physically see anything different between a clone form and the real body.