Itachi's Tsukuyomi and genjutsu made him. Without Tsukuyomi, I believe Itachi would've had a much harder time dealing with Kakashi back in part one.
I honestly see Kakashi and Itachi on par with one another (minus Itachi's MS abilities) due to the fact that they're both prodigies. Itachi has genjustu over Kakashi, however Kakashi has ninjutsu over Itachi (IMO). Taijutsu would be more or less the same as for speed Itachi's probably faster but Kakashi can keep up.
Difficult to say really, it may come down to whoever lasts longer, meaning chakra.
I honestly see Kakashi and Itachi on par with one another (minus Itachi's MS abilities) due to the fact that they're both prodigies. Itachi has genjustu over Kakashi, however Kakashi has ninjutsu over Itachi (IMO). Taijutsu would be more or less the same as for speed Itachi's probably faster but Kakashi can keep up.
Difficult to say really, it may come down to whoever lasts longer, meaning chakra.