Not too long ago, I decided to upgrade my amp from my Michi S5. Ended up rebuilding my whole system-all for the better-but this is about amps. The Michi S5 is, i think, outstanding at its price point. I listened to lots of amps and auditioned some at more than twice the price of the S5, without significant gains to my ears.
I tried to sell myself on tubes, but this is where we all hear differently. I listened to ARC, CJ, and VAC pretty seriously, liked VAC the best, but that is just not for me. To my ears, these create a very pleasant sound, certainly something I could be happy with, but its not natural which is what I consider musical. Its like a cup of coffee with a bit too much sugar. A little sweet, a little soft but lots of folks love that sound. These are all wonderful products, but not optimum for me.
I ended up with a Burmester 218 and Burmester 808 mk5 pre. This combination produces a very natural sound, plenty of speed and well controlled bass-much more faithful to the music to my ears. Contrary to producing some sort of sonic explosion, I find the sound to be a faithful reproduction of the music delivered with control and appropriate speed-never soft, but never bright. If anything, the 808 pre imparts just a touch of warmth. I've spent a lot of time listening to Boulder. The Burmester sound is not the same as Boulder, conflating the two is inaccurate as I hear them. Which one is "better" is a matter of taste.
Coupled with the Zellaton Plural Evo speakers, I'm really happy with my system-best amps and best speakers I've had in my room-to my ears, maybe not yours.
To your question-is it waay better? Not sure how to measure that-I think with amps, once you get to a certain level the improvements are real, but incremental and nuanced. I'm certain I made a move up-again to my ears. I think speakers are a little different-transducers make a bigger difference in my opinion. The Zellatons, to my ears, are a very big step ahead of the Sonus Fabers I had, which are themselves really good speakers. The Zells are the best audio purchase I've made.
Fortunately, there is good gear to suit all tastes at all price points.