Samsung’s flagship Galaxy S4 smartphone quickly became the fastest-selling Android phone in history when Samsung announced that channel sales had reached 10 million units in under one month. That breakneck pace will surely slow down over time, but industry watchers see Samsung’s latest hero phone racking up some pretty huge numbers — according to RBC Capital Markets analyst.Mark Sue, Galaxy S4 sales will hit 80 million units this year. “Galaxy S-4 demand in the first month of availability has been incrementally better than our estimate of 10M units,” Sue wrote in a note to clients on Thursday. “In comparison, the S-III took nearly 2 months (50 days) to achieve the 10M units mark. Our broad-based channel checks at U.S. stores

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