I have an LG B6 and uniformity is perfect, there is also no colour tinting at all.
Also, calibrated the colours on the OLED are amazing.
That is the reason I have not upgraded as I know I am lucky in that regard.
My LCD experience is the Sony XE93 and the XF90, really like it, but still have the traits LCDs inherently come with.
However, I now have some screen burn (I know it is actually the red pixels wearing quicker rather than burn) where the new ticker tape has been.
I only watch for an hour each day, or maybe less, but the fact is, with OLED if you watch the same thing you will get a burn effect, doesn't matter what you do, as you rack the hours up it will happen. It isn't like plasma where if you watch other material it will get rid of it, it is simply the wear rate of the RGB pixels is different.
My B6 is now what? 4 years old, nothing I can do about it.