I dissagree ( Not a fan at all of her but still). IMO sasuke got the easiest power ups..
Got the curse-mark to power up, still he managed to '' ugrade'' chidori .. (but sakura also just trained so doesn't count) then he got itachi's eyes.. (another power up) .. all his power was ''given to him'' without any big effort. the only one who really trained to get all the power he has now is naruto.
Sasuke's sharingan: 1st comma (family was murdered by brother) 2nd comma (His life or death battle with Haku) 3rd comma (I will agree here this was just a battle between him and Naruto)
Sasuke's curse mark: He almost died, it limited his power and almost got him killed. Orochimaru wouldn't had stepped in to save him if it would had lost control.
Sasuke's MS: He learned that Itachi's death was all a cover up, so Sasuke will benefit and return to the leaf village. That failed and he suffered the loss of the most important person too him. That's not an easy thing to experience.
Sasuke's Lighting element: He trained off screen, and i'm sure it wasn't very difficult for him, but he still had to train.
Sasuke's EMS: This was easy.
Sasuke's summons: I'm going to assume this was easy also.
My point is, he didn't really have it that easy.