actually, i can't think about a single time Sasuke looked at Naruto's KB with sharingan eyes.
the only time he could have copied it would have to be in one of the boring misions they had since they came back from the wave country, and i seriously doubt that Naruto used any clones there...
if anything, the fact we can't clearly say if Sasuke did or didn't copy it counts towards the belief he hadn't. I kishomanto had plans to give Sasuke the shadow clone, then he could have easily draw Naruto using clones against lee or somewhere while Sasuke was present... but since he didn't, i guess Naruto will keep his trump card for now, at least until after Sasuke trains with Oro.
Edit: i re-read the whole fight with gaara now, it's possible that Sasuke copied the shadow clone no jutsu when Naruto did it against Gaara, but i don't think it's possible, cuz he was already out of chackra.
and Jiray4, please, grow up and stop being an idiot.
or at least, stop showing it so much.