itachi got his training from a dude who lead the whole Uchiha clan once and who also fought Hashirama, the first hokage. So what can u expect from Itachi then? I've mentioned it generations ago that Itachi was one tough mother.
As for the kind of sharingan, i think he now has eternal mangekyo sharingan like Madara. Maybe the reason why Madara got hold of Sasuke was that now there are two EMS users in the ninja world. Sasuke now has the potential to surpass Madara because now Sasuke= Oro's techniques (jutsus)+ EMS and Madara has only EMS working for him.
Itachi himself could have surpassed Madara had he not been riddled with disease and his love for his brother. We should remember the fact that it was Itachi's love for his brother that kept him from taking Sasuke's eyes. No love, Itachi would have been the storngest ninja in all of the countries. Thats why they say, in war, there should be no feelings and emotion. Its a person's weakness. And the last thing u want is ur weakness discovered by ur enemy in a battle field.
