If it's obvious you can see the dead pixel then it should be covered.

There are various reasons for the flare.
1) Your friend's lens have better coating to reduce the flare (I think this would be the more unlikely than other reasons)
2) What same light source? If it's the sun, the intensity of the glare each hour/day is different. Clouds movement/shade affects as well.
3) A slight variance in angle can also affect/produce/reduce the flare
4) Camera settings/white balance/exposure/focal length/etc is different?

first take a picture with flash activated on a piece of white A4 paper (or anything that is white).
secondly take a picture with flash deactivated on a black surface.

now u have a black and white picture. now bump up your screen brightness to maximum.(it may hurt your eyes)

third step is to go to the white picture, and look carefully for any black dot that is permanent. do the same for the black picture, but now look for a white dot. if u have a white or black dot, then u have a dead pixel. if u found none, congratulations, your screen is perfect 

There is a wrapping service which look very professional in pavilion. In front of Harvey Norman.
But seriously in the life of me, I do not see the benefit of wrapping. It doesn't provide any knock and drop protection. Might as well get a thin air casing.

My last case was spigen rugged capsule.

Now totally naked.

Interested in skins?

My iPhone 6 Plus’s casing is popping up. Is it due to bloated battery?