Hey folks.. Everyone who says that it's normal.. It's definitively NOT! As I've already said, I've checked 2 iPhones of my friends and they don't have that problem.
For all of you who say: oh it's not relevant in real life. It's actually is.. Check out my instragram slowmo-video:
http://instagram.com/p/tLQs25H_mQ/?modal=true
It's not even pitch dark and you can clearly see the hot/dead/stuck pixel above my head. It's freaking annoying. I've got more of them, but THIS is visible every time..
So don't accept this sensor failure and exchange that ****.. My new Iphone arrives on tuesday.. I hope without dead/stuck/hot pixels