I am going through my music library right now and one thing I am constantly noticing is that the V6 are extremely revealing of poor recordings. If your library consists of Mp3s below 320kbps, then you might want to do something about that before getting the V6.
I am listening to Joshua Redman's albums (which are very well recorded) 16/44.1 khz (it's not even hi-res) and what I am hearing is absolutely delightful.
Great! I will be mainly listening to jazz.