Does your MBP Retina 15 have bent screen glass in the upper corners?
I have a new 15" MacBook Pro and I am trying to figure out if this is normal or not. I had an older 15 MBP Retina and it did not have this characteristic. Maybe I'm crazy, but I am more concerned about potential for issues down the road as far as dust getting behind the screen and whatnot.
Sadly I don't have a working battery for my DSLR so I cant use my Macro Lens. Using my iPhone though it seems easier to look at the reflection than it was getting it to focus and show the line.
To me it looks like the glass bent and maybe even cracked. I am guessing there's some additional coating on the user facing side and this is what's making it look less significant and holding the glass into place. If you imagine a clear piece of plastic, just think of what happens when you fold a corner and make a crease. This seems to be a similiar issue.