With over 11 million units sold in its first month on the market, Samsung's (NASDAQOTH:SSNLF) Galaxy S5 is an unqualified hit.

And yet, no one should be surprised to read that. Despite stiff competition from Apple (NASDAQ:AAPL) and other Android handset makers, Samsung has emerged as the top dog, controlling more than 30% of the smartphone market in the first quarter.

Success has come with each new handset. From the Galaxy S selling 24 million units out the gate, to the S3 achieving 9 million pre-orders, to the S5's sparkling debut, Samsung is putting up the sorts of numbers you'd expect from a leader. A company capable of challenging Apple in its most important business.  

In the following slideshow, Motley Fool Senior Tech Specialist Tim Beyers provides a visual history of the Galaxy smartphone series and answers the question of whether now is the time to buy Samsung shares.