I, too, waited too long to upgrade the electrical path. Skeptical of SQ improvement. Well worth it. Hearing is believing. Especially if your system is true to the source.
Dedicated circuits
I just completed installing 2 dedicated circuits. After reading several threads here, I went with 30 amp breakers with 10 AWG wire with high end receptacles. One circuit for the amp and the other for everything else. I’m blown away by the difference. Tighter bass, not as bright, better imaging and soundstage. Should have done this long ago.