Samsung’s massive, glitzy advertising campaign pretty much ensured the Galaxy S4 would be a blockbuster hit, something the South Korean company preliminarily confirmed when it announced sales had exceeded 10 million earlier this month. Even with competition from HTC and Apple, market watchers RBC Capital Markets say the S4 is in no way losing momentum, and could potentially hit sales of 80 million units this year.

In comparison to Samsung’s last major Galaxy S device, the S3, sales have been exponentially better, RCB analyst Mark Sue reported today in a note to clients. While the Galaxy S3 took nearly 2 months – 50 days – to achieve 10 million in sales, the S4 took only a couple of weeks. Sue said that, given the incredible demand at local retailers, the S4 is on track to cross the 20 million shipment mark by the end of this year’s second quarter.

Sue said Samsung’s future looks bright and rosy. He expects the company to launch the successor to the Galaxy Note II in September, and believes smartphone growth this year will be driven by mid-range and low-cost phones like the products Samsung continues to refresh. In other words, Samsung’s poised to remain a market juggernaut for some time.

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