Worried about purple halo in your iPhone 5 ???

iPhone 5 users have been reporting the purple halo in the pictures taken on the camera with certain angles with the source light. Is this restricted to iPhone 5 only ? Do other phones produce such halos ? What could be the possible reason ? And finally is it a normal thing or something to worry about ?
Jacqueline Seng of CNET Asia has answers for all your questions in this article.
http://asia.cnet.com/is-the-iphone-5s-purple-halo-normal-62218983.html