Its ironic that no one mentions that Samsungs flagship havent even started selling yet in the american market, while many are fast to bring up the "carrier card" :- )
Yes, the Samsung Galaxy S II really has been doing phenomally well abroad. It still has yet to reach US shores (and when it does, Verizon is not going to have it, only AT&T, Sprint and T-mobile) and in Canada, only Bell currently sells it out of the 3 major carriers.
Seems to me on the "carrier" front, Samung and Apple are pretty much equal there. Of course, Samsung has broader coverage thanks to their lower-end models though.