Perhaps I wasn't clear enough with my posts, the M3 is a luxurious all-rounder, the Boss is a beefed-up version of a more attainable sportscar.
My point resides on the fact that if you want to have fun on the weekends and money isn't relevant, you'd have a nice track comparison, but unfortunately, price does have a profound effect on the success of a car. And still, which one of these would take from work to home in more comfort, and which one of these would put a grin on your face when people are impressed with the quality of the cabin and the awesome seats? They are on different price leagues and again, have completely different ethos. The BMW justifies the extra premium by being a premium car on the road.
They have pretty similar performance figures, mechanical layout, engine, at cetera, yes, but they are on completely different categories.
Why not to put a Cadillac CTS-V on the track to face the M3 then? It is a luxury fast car as the M3 is. The Boss disregards luxury to an extent and works to be lighter and louder, different ethos, different approaches, different price tags. They doesn't share the same market slice.
Well, this is at least the way I see them, if I wanted a muscle/pony car, it would between the Boss and a Challenger SRT8 392, if I wanted a Luxury Sports car, M3, RS5 or CTS-V. These aren't interchangeable categories, they just don't mix.
EDIT: What Kent said. 👍