It's really only if you put it to less than 15% brightness with dark-grey wallpapers that you'll be able to notice a slight grey hue around the edges of the display. You have to be in a fully dark room in order to see this at all, which is why I wonder if I should even bother getting it replaced. I just worry that it'll get worse as seen for some people.I have no clue how or where to even check. Mine seems just fine though.
In order to check if you have an LG or BOE screen, you'll need to download the app called 'Device Info HW' from play store. I wonder if I would have noticed this problem if I didn't hear about it from reddit/XDA. Ignorance can be bliss.