The highly anticipated Galaxy S4 is out, and Samsung's flagship smartphone looks to make an immediate impact in the mobile device market. But before the Galaxy S4 can take on Samsung's archrival Apple and the iPhone, it has another Android smartphone to contend with: the HTC One. HTC's new flagship phone was launched in March, beating the Galaxy S4 by about a month. Now the two smartphones are lined up to battle it out for Android dominance. So how does these two devices measure up?