Do I really need a dedicated circuit?

Two sentiments repeated over and over on the forum:

1. With respect to deciding on potential upgrades: listen first. Insist on a home demo if you can.

2. A dedicated circuit is one of the best value for money upgrades you can do.

Of course, you can't really home demo a dedicated circuit, right?

Which brings me to the question of whether it would make sense in my case. Perhaps it's a question of the "definition" of a dedicated circuit. My system is plugged into the power strip provided by my Naim dealer, which is then plugged into the wall.

My question: if nothing else is turned on, on the circuit that my system is plugged into, does that in fact make it a dedicated circuit? (It's pretty easy to do this -- I live in a fairly new detached house, and I can turn everything off in my music room, and adjoining rooms for that matter.) Or, is the test more stringent: if nothing else is connected to the circuit that my system is plugged into, does that make it a dedicated circuit? Or, does just the fact that there may be, for example, unused outlets on the same circuit as my system render my circuit "not dedicated" and argue for the upgrade?

Thanks for your advice.