While there are improvements, there are also compromises.
The image quality is better - it's clearer, especially towards the edge of your field of view (the DK2 image got blurrier the further from the centre of the lenses you went). However, the compromise is that they used fresnel lenses to do that, which results in god-rays type effects that are most noticeable when you have a bright image set against a dark background.
I'd also argue that the FOV is slightly smaller than the DK2 (which itself was a bit of a drop down from the DK1), though it's fairly negligible.
The tracking volume is certainly improved though compared to the DK2, meaning you can lean/walk around much more easily than before.
Overall comfort is excellent (though if you wear glasses, larger frames are a PITA and IMO unusable, to that point that I've ordered some smaller frames). The built in headphones are surprisingly good indeed.
I received my CV1 as a Kickstarter backer freebie, but if I'd paid for it, I genuinely think I'd have been wondering whether to keep it, or sell it and stick with my DK2.
As it is, I'm keeping it, and will pick up the Touch controller when they launch (which won't work with the DK2 BTW, as they apparently communicate via the headset).
