The G platform may be already outclassed and it has not been released yet
Jaguar has confirmed AND tested the XE built in Coventry by their SVO guys....5.0V8 Supercharged 600hp...AWD and lighter being based on the XE platform...
the ONLY caveat is that it will limited to 300 cars for the 2018 model year...which means $$$$$
The M cars have gotten bigger (size) and in some cases heavier than the models they replaced...they also have been much better from a performance perspective...
however that has come at a cost...many long time M owners have lamented the "lack of feel" that the new M cars have compared to the older ones...
The M5 is a great Bahn cruiser for sure...and I would not class it the same as an Quad. The Quad owner is clearly in the M3 ZCP camp....smaller, lightweight sedan, big power, tossable cars..
funny though about the new G, it will be auto only. waiting to see how the M guys react to that...
the last analog M5 is my E39...