Has anyone noticed that the brightness on the macbook pro retina is not as bright as the first day you got it? I'm not sure if my eyes are playing tricks on me but I'v had my new replacement since Friday and the brightness seems to be dimmer then the first day I got it, also are some units brighter then other? this is now my 5th replacement and I find that this one is not as bright as the last 2 I had, I'm I just going crazy