I’ve heard three systems that were roughly $1M (or more) all in at dealers where they were not fighting show conditions.
Wilson with Burmester electronics
Wilson, D’Agonstino preamp/amp and DCS Varese
MBL Extremes MK II and MBL electronics
The MBL was the only system that wowed me. It was truly spectacular - not more so in resolution but in presenting music more like I hear it in real life. The others were revealing but not more musically satisfying than my own system. I came away grateful for what i have. And I don’t need a monstrous room dedicated to monstrous gear that i don’t care to look at to enjoy it. Of course, i know that some would look at my system and wonder what i spent and why I lack common sense so i suppose it’s all perspective and relative.