The launch of Samsung Electronics' Galaxy S IV will set the stage for this year's battle for smartphone market share. Competitors such as HTC and Sony will face an uphill battle, even if they release great products, according to analysts. With the launch of products like the HTC One and Sony Xperia Z, Samsung's Android competitors have done their best to develop products that can take on the upcoming Galaxy S IV, which will be announced Thursday evening local time at an event in New York.