Those are really good impressions. Thank you for contributing to the community. However I would like to add one thing to your review and the equation.
Usually I find it less useful to compare headphones side by side by A-B'ing them. In some cases it is useful and necessary but here's my point. I think the interpretation of what we hear is heavily influenced by what our ears-brain used to hear. So what I would recommend is to listen to the Quads for an extended period of time and then listen to the V6 for an extended period of time. Long enough to getting used to its sound signature and then go back to Quads to evaluate the differences. I remember doing this with full size cans back in the day and I've had better results than comparing them side by side. The phones that I thought were amazing and performed better actually ended up not being so after I gave the new phones the same period of listening time.
Just my two cents.
I too agree.
My review was just a brief first impression.
I listened to the V6's for a couple of hours before switching back to the Quads. I'm going to give these around a week to acclimate to them. Give myself time to adjust to them. I did the same with the V3's and Quads. Taking them to work, listening to just one for a week on my commute and then using them live on the weekend. Switching back and forth each week over a month period allowed me to recognize their personality, sound spectrum, individual characteristics...
I hope my opinion has more depth over the next couple of weeks.