I have the new Paperwhite and the old Paperwhite and the Voyage. When I put them side by side to compare the new Paperwhite's screen doesn't look quite as good as the others. When I'm reading with it it's just about perfect. I think it's important to distinguish between comparing and reading. Little by little the new Paperwhite is becoming my reader of choice.
I also have a Nook Glowlight 3, which has a noticeably better screen than any of my Kindles. It's a remarkable screen. But it doesn't have some of the features I like in the Kindles and the dictionary is grayed out and hard to read. So even with it's better screen it's not as good for reading, although it is pretty good.
I'm really pleased with the new Paperwhite. For the first time I'm beginning to wonder if I really want my other readers anymore. Gadget freak that I am I'm sure that'll pass but no other reader made me even consider something so heretical.
Barry