Galaxy S4 going head-to-head with Apple Samsung Electronics is making its biggest run yet at the iPhone's U.S. loyalists, unveiling its new Galaxy S4 just a few blocks from Apple Inc.'s flagship store in New York and broadcasting the event live in Times Square. The debut of Samsung's marquee smartphone at Radio City Music Hall Thursday lets Samsung bring the fight directly to Apple's strongest market. The South Korean company is relying on an advertising blitz and cutting-edge features, potentially including a snazzier camera and eye-tracking capabilities, to generate the kind of buzz usually associated with Apple's products. While Apple's iPhone pioneered the market for touch-screen phones in 2007, Samsung became the smartphone leader worldwide more than a year ago, according to IDC. The mounting competition puts pressure on Apple to step up its pace of product releases. Since the iPhone's initial debut about six years ago, the company has held one big phone unveiling each year, with the new product hitting the market in summer or early fall.