Compared to other smartphones (e.g. Samsung Galaxy SIII) iPhones exhibit an extraordinarily high SAR value. The new aluminium back of the iPhone 5 even adds to that. Do you take that into your consideration when deciding for a new smartphone?
It varies by which radio and what band it being used but the max SAR for the iPhone 5 is 1.25. That is well below the FCC limit of 1.60. And no, we don't need to worry; the whole thing is bunk science.