Apples to oranges comparison. After nearly 3 years of 1M ownership i sold the BMW and bought a 2011 GT3. The 1M is a nice, fast every day car, must say best real life performance i ever experienced, but... driving it however never felt like an occasion, fun but not that special. Took it twice to a track day and it was one of the least confidence inspiring car i ever drove on the track! High sitting position, roll, eruption of torque - fun yes, confident no. So i added a Renault Clio 200 cup to my stable and used it on track, what a hoon! Yeah i sound like that Randy Pobst guy
GT3 is on different planet, so mechanical, no doesnt feel as fast due to smaller torque but then you look at speedo and youre doing 300 kmh... (Germany). And at last, driving it, even seating on the fixed carbon buckets, makes one huge experience. Not an every day car though.
Im not bashing on 1M, one of the greatest car i ever had, but comparisons with GT3 dont make much sense.