Probably the biggest smartphone release of the year (until the launch of the next iPhone at least), the Galaxy S4 marks the pinnacle of Samsung's sprawling smartphone offering.

Building on the huge success of the Galaxy S3 in 2012, the Galaxy S4 promises much. According to Samsung's advertising things are much better when we don't have to touch the screen and it's suite of gestures and eye-tracking technology promise to change the way we interact with our smartphone.

But can the Galaxy S4 really make such a big leap, or are these features simply gimmicks to hide a relatively minor upgrade from the world's biggest smartphone manufacturer?

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