How the Galaxy S 4 stacks up against iPhone, S III

Samsung Electronics Co. revealed its new top-of-the-line smartphone Thursday, the Galaxy S 4. Here’s how it compares to the competition and its predecessor, the S III. Cameras: 13-megapixel on back, 2-megapixel on front. Storage: 16, 32 or 64 gigabytes of built-in flash memory, plus a MicroSD slot …