I've owned a pair of A7X since 2011 and have been very satisfied with them, but one of them broke down recently. I bought these hoping for an upgrade and got exactly what I wanted. The stereo image is immaculate. Maybe, just maybe, snares sound a bit snappier on the A7X, but A7V excels in bass, the high end of treble (hi-hats and cymbals have way more detail than on A7X) and dynamics (the difference between loud and quiet sounds is more noticeable and even when a loud part of a song is playing any quiet detail in the back can still be heard). The speakers also display the volume differences between for example loud and quiet mastering very clearly as you will probably be reaching for the volume control if you first play some rock or metal music and then switch over to electronic music. A big plus for the DSP function.
Overall, I'm extremely happy with my purchase.