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I can't see a difference between Libra, Libra2 and Sage screens.
The PW3 is slightly poorer. The PW4 looks fine till you see it beside a PW3, then it's not as good. Side by side even the original Aura H2O HD looks better than the PW4, despite being lower resolution.
That's all with front light off. There is variation on eink screens of same model panel, unlike any other display I've used, and the front light is even more variable in quality for the same models.
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