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If you view from close in, the angle of view may cause that effect. If you view from a meter or two back, does it still look that way?
 
All of them are like this. When I first got my MBP I was horrified, but I went to Best Buy and the Apple store and to my surprise every single screen had a tint near the edges. I dont notice it anymore.
 
First, the term mini-LED display is wrong. It actually is an LCD panel with mini-LED backlight.
Second, yes, a subtle difference in colour will be noticeable on different angels with LCD panels. Even with todays panels, there's always a variance noticeable. Its inherent to the LCD technology.
 
Looks normal to me. Some may be worse than others, according to some reports, but yours looks a lot like mine.
 
The displays are typically brighter at the center, another thing affected by angle of view.
 
@aibo82 It is normal. Actually it can look even worse on camera, due to the camera optics and processing.
You can read here some more about LCD displays, its pros and cons.

Professional displays that have the least viewing angle problems are way more expensive than the ones used in Macbooks. For best colour accuracy and purity, you'll probably want an external OLED display.
 
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