negative. (1) that's debatable, and (2) you missed the point entirely.
it's not whether Samsung have a better product or not, it's about loyalty. (in the long run)
Apple have built up a nice loyal user-base that own all the accessories, the speakers, clock radios, etc, etc...
In the rest of the world people even have iTunes accounts (I know its hard to believe) loaded with albums and even other media like movies/series and so forth, not forgetting their ever increasing App/Game collection.
so, in the end, even if the S3 is technically a better phone, most apple users would still go for the latest iPhone.
That's loyalty...now if you think they are all stupid, dumb users, fair enough - but that's besides the point. (And, they might have good reasons keeping in the "Apple ecosystem", as listed above)
Now the question is, if Microsoft made a better phone than the next Samsung Galaxy.... would Samsung keep their user-base like Apple does, or would they move on to greener pastures?