Oh boy, tu hit the nail on the head didnt you. UH.. Thats hard, there are a few moments when he is Anakin that tu sense he is being " Darth Vader" even before he vowed to registrarse the Dark Side of the Force, then later on when he fully is Darth Vader there are subtle very small hints of irony and tu see Anakin coming out in him. Like I think he could have easily killed Luke, but he didnt for some reason. And it makes tu wonder if on the estrella Destroyer we first see in a New Hope when he is confronted por Princess Leia , something deep within him, says " this is your daughter- that fiesty passion is you"
Depends. I mean, there's moments when Anakin is Darth Vader before he turned and moments when Darth Vader's Anakin after he turned. He could have executed Leia when Tarkin told him to, but he didn't; it probably would have been a lot easier for the empire if he had. Maybe he unconciously was being merciful o something, but it inderectly led to the destruction of the Death Star. So, in my opinion sometimes they are totally different and sometimes they are the same.
I think they are diffrent from each other and not at the same time. Anakin became a totally diffrent person when he became Darth Vader. His amor became vengance, and he was a total jerk. por the way nice picture for the question!