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PW4 in decent ambient light is slightly greyer than a PW3, with front light to off/minimum.
Other than that they look identical quality.
The Kobo Libra is same white/grey contrast in same lighting as the PW3 but is 7" rather than 6".
The Kobo H2O original is roughly the number of dots as PW3, but stretched to 6.8", so indeed it's slightly less sharp than the PW4, PW3 and Libra. However it's got the best contrast/brightest screen of any eink I've ever seen with the same ambient light and no front light (perhaps because IR touch). I find it better than the PW3 despite not quite as sharp. The Libra is same sharpness as PW3 and PW4, same brightness/contrast as the PW3, but 7", which is very nice for most novels.
I don't have a voyage, so can't say. It seems expensive for what it is and on specs seems to have little advantage over the PW3.
I bought a new PW3, last of production maybe, just after the PW4 came out because my wife had the PW3 and I thought it "better" than a PW4. I don't need waterproof. Though the H2O original and Kobo Libra sort of are, using different methods.
If you HAVE a kindle, and Download via PC, then you can read books from Amazon for THAT kindle, on a Kobo using Calibre and a plugin.
Certainly if you had a Basic Kindle Touch or a PW2, the PW4 would be a worth while upgrade. It doesn't seem worth it if you have a PW3 or PW4.
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