iPhone 5S screen gap

[asdfgbg]

Hey guys,
i just received my iP5S Space Gray, 16 GB and I noticed that I have a slight gap on the top right corner.
At a certain angel, you can see the top right antenna. I'd guess the gap is 0,2-0,4 mm in size...
Is this gap normal or should I be concerned ?

 

[*~Kim~*]

I have a gap (I think it is anyway, I have a see through case on) just under the power button. Didn't notice it for a while and unless you are in the 14 day return window, I would guess that Apple would only allow an exchange if it caused the phone to malfunction.

Gold 32GB, week 42, DN factory.