Originally Posted by
Y
I stopped reading the comic a while back, but isn't the idea that Itachi can instant-kill people kind of suspect at this point? He said himself that him and Kisame could manage a draw at best against Jiraiya which certainly is selling yourself short if you can kill him by looking at him. He ran away from Jiraiya rather than, say, instant kill him by looking at him, which he certainly had the opportunity to do. The two times he has used the Mangekyou Sharingan on someone were just to torture instead of kill them, and the worst damage the Tsukuyomi looked like it would do was drive you insane or turn you into a vegetable (which admittedly is still pretty severe, but doesn't kill you).
Has he actually used the Mangekyou Sharingan to one-hit kill anyone, yet?