I think it's a very well done ad.
Years ago I used to drink the non-diet versions of Pepsi and Coke. As I remember it, Pepsi beat Coke hands down, in my opinion. I even took the "Pepsi challenge" at the state fair, and was able to observe as others took it. Pepsi won consistently.
Eventually I converted to the diet versions, and grew accustomed to the diet sodas. Once I became accustomed, the sugared version started tasting as bad to me, as the diet version probably does to the regular soda drinkers.
In the diet versions, Coke beats Pepsi. That's all my subjective opinion, of course.