Do high dollar mono blocks truly improve the Sound Quality over the mid tier amps

Skinzy if anyone was a die hard class A, AB or tube amps 

my preconceptions were destroyed after hearing the AGD Class D- GAN Fet amps 

are the future they beat with relative ease anything at their price point and well above. Is it the best I have heard ,No. but you have to spend multitudes more.

my brothers Tenor Amplifiers ,no longer made  SS- tube  are 

classic greats when new $100k.  Just check the AGD out ,the Jeff Roland is very good also but much fancier case work ,and cannot say they are better.

With a focus on downsizing and having moved to Class D several years back, I have no practical interest in large heavy power guzzling amps anymore. That’s just me. To each their own. Especially when it comes to what look and sound happens to float one’s boat.

The other recent gamechanger for me is applying DSP for room correction, sound tweaking to personal preference, etc. I easily enjoy a lot of gear much more than I would be able to do otherwise were it not for DSP done well.

Practically, I am mostly off the equipment merry go round at this point. I still like trying new things, but it's now more because I just want to rather than that I need to.

I agree dsp can tailor the sound to your liking.

I also agree that quality DSP is a game changer.  My Weiss Helios has many ultra high quality DSP features that are extremely useful.

The Class D's also offer a viable alternative as @audioman58 suggests.  Low energy consumption and light weight.features are very compelling. 

@skinzy Its not just low heat and light weight! Class D offers design criteria to the designer that also allow for some very nice distortion characteristics.

In case you are not aware of this fact, the difference you heard between amps when you upgraded was the difference in the distortion signature of those amps.

Class D offers a means to keep what distortion is made quite innocuous to the human ear. So if they are designed properly they can be very musical, erasing the advantages that class A or AB operation used to hold.