Woah. Somewhere in there is the definition of exaggeration
Your right, since part 1 he has increased his power. Perfected the curse mark, absorbed Oro to gain more strength, Itachi gave him some power (amaterasu), made him stronger and now has taken Itachi's eyes, gotten even stronger. All these (from what we have seen so far) does not mean he is near Madara's level. I mean I for one
definitely say he worked really hard to get all these powers and stuff >.>
But anyways
1. Yes, looks like he has mastered it, IMO he already had. Too many ninja can do this for it to even be impressive :S
2. Unless it was a translation error, I saw him just say "sharingan".
3. Looks full indeed, was instant (as always with all Susanoo users) and we can't tell if it isn't a chakra drainer just by that, at all! So upgraded Susanoo (better defense) now you want him to get the mirror on top off that! Wishful thinking, but I don't think so (too OP if he did)
4. This would be cool, but only if it isn't mastered yet, like he can't use Susanoo at the same time sort of thing.
Nice prediction on it not taking as much chakra, I think so too, but so much that, as you said, "showing no drain to sasuke at all" I don't think so.
What do you mean 2 pairs of eyes... I am sure he can't use his old ones and his new ones won't fail him = no need for old ones :S Hope that clears up that.
Can't wait to see Sasuke's new powers, but honestly the thing I kind of want to see if more control. Especially with emotions and chakra control.