I'd say the markets overlap. A Supra petrolhead might consider a Plus 6.

As you say, the magazine journalists are not blown over by wither the Z4 or the Supra.

As you say, can MMC step up to the plate with at least US Quality standards?
The Plus 6 is light, which will help its corner. I've not calculated bhp/kilo for the three.

Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...