I've tried two different iPad Pro 12.9 4th gen models now and they both exhibit the same slight uneven screen uniformity. That being, when on a white/light background, the top right (when in landscape mode) is a little darker. In fact, about an inch of the whole right side is slightly darker but it's just more noticeable in the top right.
So before I go out and try a third, is this just how they are? I've looked online and seen the odd mention of it. More so with other models and with them it seems to be just how they're designed as even when people tried multiple replacements, it was no different. It's the type of thing you probably wouldn't notice unless looking for it but one of those once you see, you can't unsee things.
I admit that I am particularly picky about these things as I always seem to notice it for some reason. But, I always think for the cost of these things, they shouldn't have any noticeable uniformity issues.
So before I go out and try a third, is this just how they are? I've looked online and seen the odd mention of it. More so with other models and with them it seems to be just how they're designed as even when people tried multiple replacements, it was no different. It's the type of thing you probably wouldn't notice unless looking for it but one of those once you see, you can't unsee things.
I admit that I am particularly picky about these things as I always seem to notice it for some reason. But, I always think for the cost of these things, they shouldn't have any noticeable uniformity issues.