Hi,
In answer to your initial question, yes if you are willing to spend the extra.
I was looking for amps last year and got to Naim 5i, too quirky, Kandy k2, didn't like the looks and Leema Pulse but all were good but nothing thrilled me and was getting a bit confused.
I decided to see if spending the extra on either a Naim xs or Roksan Caspian would give me what I was looking for bearing in mind most amps I have had for minimum of 10 years.
There was some improvement with the xs over the 5i but it was a step up, when I heard the Caspian next to the Kandy the difference was staggering, bigger louder, more dynamic more detail, more emotion. I couldn't stop listening to the set up ,huge smile on my face and all the confusion had dissappeared, I had found what I was looking for.
All very subjective but in my mind the Caspian is worth the extra, go listen to it next to a Kandy, the difference is a joy.
I heard the M3 and found it too smooth for my tastes, I have had Rotels before but have never loved them and I have not heard the 1520 but I adore my Caspian. Good Luck