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For me, the only thing that matters is the screen quality. Other features are not essential, I consider my Kindle as a book, so I don't expect too much features, I have a Kindle Fire for other purposes.
So I will upgrade only if they come up with a better screen.
From K2 to K3, the screens technology was upgraded (from E-Ink Vizplex to E-Ink Pearl), but from K3 to K4/5, there is no change in screen technology. Some people even complain about the quality of K4 vs K3 and K5.
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