I went from a Paperwhite 2 to a Voyage about 3 weeks ago. I had to save for a while to pay the price for the Voyage and after I'd saved enough I still held off for a few weeks because I couldn't quite convince myself it would be worth it. Now I have it and I'm glad. It's worth it to me.
When I put the two ereaders side by side and compare them I have to say I think the Paperwhite screen looks just a little bit better. They both look really good but the Voyage screen is a little bit cooler in color and has a kind of translucent look that the Paperwhite doesn't have. That's when they're side by side and the difference isn't great. When reading on them they both seem perfect. I look at whichever one I'm reading and wonder how I could have doubted it was better.
The real difference is the way the voyage feels in my hand. It's a lot more comfortable to hold. It's light and small and just feels good and, by comparison, the Paperwhite, which once seemed so elegant, now seems big and clumsy and heavy to hold.
I first became aware of this when I started comparing my Paperwhite to my Kobo Aura. The Aura isn't nearly as nice a screen and it has various problems but it really feels good in my hand. I think that's what made me bite the bullet on the Voyage.
Right now I'm doing some active comparison of the Voyage and the Aura, reading a chapter of my current book in one and the next chapter in the other, going back and forth. The Kobo is winning so far because of how it feels in my hand but the Voyage is a big improvement over the Paperwhite in that regard and it's screen is so much better. This kind of comparison is just an exercise. No matter which one wins the Voyage is going to be my main ereader. I'm a very biased judge.
Barry