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Both the Voyage and the Oasis (and to a lesser extent the new Kobo Aura One) have this issue with the colour gradient from the lights. On some it's fairly minimal, on others quite apparent, and I think the Oasis is more problematic due to the lights being on the side so it makes the gradient appear worse as it goes across the screen and not from top to bottom.
My Voyage looks almost perfect in some lighting conditions, but certainly in the dark I can see that slight colour variation where the screen gets darker and yellowish/brown nearer the top.
I think some people are bothered even by the fairly minimal colour shift (I tend not to read in complete darkness because it bothers me, but then I'm fine to have my small lamp on in bed at night). Going by the photo you've posted which is not the worst I've seen, unless you get lucky with your next Oasis, I think you might be sticking with your Paperwhite for a while longer.
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