I would expect you would have to go to some meetup to be able to compare them as I see the possibility of someone having heard or owned both very small.
Now that I've had the V800 for a few days I've tested it with the V200, SPL Auditor, HD 800, LCD-2 and my speakers which are B&W CM8 with a couple of subs. With all of them the change in the character of the sound is similar compared to my old dac. All the elements of the sound seem "tighter" and more clearly defined as separate entities of the sound. It's as if the old dac was smearing everything together in comparison. The high frequencies seem cleaner since some songs with ringing effects sound more like natural instruments now, where they before could be slightly harsh. A big upgrade is in live recordings with heavy acoustics present in the recording where the reverb seems more separated from the instruments now, so it's easier to focus on any piece of the recording without the sound seeming too vague and congested. In binaural recordings the soundstage is more holographic as well.
I'm not seeing any downsides with the upgrade yet. It's been a proper upgrade, and not a sidegrade.