No evolution here. I started with a pioneer receiver- tried a yamaha receiver, and ended up with denon integrated. I like the Denon best, though I am not at all sure this has much to do with any kind of upgrade. More it seems the Denon is easier to deal with. the improvements have really come along- at least to my ears, as I have found compatible components to form a system with. At this point I have come to question whether the pioneer might not have made a better impression on me had I given some thought about how it worked and what might have worked well with it. Perhaps I had it all right in thinking it was hopeless- and certainly my negligence assured it would be), but now I can think of ways I might have emphasized or played down different aspects of it very characterful sound. Sort of a wasted opportunity, I suppose, but I am nonetheless pleased with the direction the Denon took me and I havent any dire complaints.
