I have been steadily improving my audio system for now more than 50 years. Among power amplifiers, I have owned Mark Levinson and Krell (both Class A). Now I own McIntosh 611 mono power amplifiers. In my system, the resultant sonic reproduction is simply better than with my predecessor amps.
I am repeatedly amused by these claims regarding how a particular component sounds. The only valid observation is how the system — residing in the room — sounds. All I can say is that what I am able to hear through my system in my room is mind-boggling fantastic (and my audiophile friends concur), and part of the reason is my McIntosh power amplifiers.