I got to say, the rear camera is definitely defective on these units and I am surprised that we aren't making more of a stink about it.
I have looked at some of my recent pics in full res and it clearly shows that the camera is not focusing right. Most of the times, it's hard to tell, if you are just looking at the image on your phone screen, but blowing it up at full res will show.
Also, we all know that the camera does not focus at first, you have to shake it, or point it elsewhere to focus and then bring it back to your object, but even after doing that, some of my pics are out of focus.
Yes, I have removed the little sticker on the lens.