OPX AMOLED Screen Uniformity?

Does anyone else notice any uniformity issues on their OPX from top to bottom of the screen? By this I mean does the bottom of the phone seem slightly darker then the top when displaying colors?, most noticeable when displaying solid grey, and slightly more noticeable at lower brightness levels. I have read many other forums regarding Amoled on Samsung devices and a lot have had this same issue which is described to be normal for these displays. I even had an extreme case when I bought a Samsung Galaxy Tab S, however the second unit I got was much better. Here is one of the forums below, I will also post some of the images on my screen. See the color of the green on the Google play store from left to right, as well as the grey's left to right in spotify app. From my observation the screen looks darker on the left then the right. Please let me know if anyone else notices this and if it is normal, I really do not want to go through the hassle of a return if unnecessary.

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