I have / have had all of them. I suspect the VII might be a better amp than the IV, going to dive into that soon.
While the lead tone on the IV is fantastic, it's a little compressed for my personal taste. The clean channel is nothing special and R2 is the worst tone I've ever heard from a Mesa. So to me the IV lives & dies with the lead channel.
The VII on the other hand really got the 3 channels right. So the question is, is the IV mode on the VII as good as the lead channel on the IV? That's what I aim to find out this weekend.