I like two-doors with monumental engines: the Ferrari 812 Superfast, the Mercedes AMG GT, the Aston Martin DB11. When you're talking about GT cars, you've got me at "G."
This is, of course, age talking. I'm not a youngster, so taking a sports car hard into a corner appeals to me less than it once did. Going fast in a straight line is fine, of course. If I'm surrounded by luxury, so much the better.
The M850 is what we might once have called a "fine automobile." You certainly feel fine in it, sort of like Goldilocks: it's not too stiff, but it's a bimmer, so it's not too soft either. The car is cut from lightweight aluminum, but it manages to soak up the bumps relatively well (it tips the scales at about 4,500 lbs., so it's not a featherweight).
The V8 serves up 70 fewer ponies than what I savored in the M5 last year, but that's to be expected with the sub-M-Sport M850i. To be honest, I don't need 600 hp to have fun — 500 and change is good by me.
The 850 I tested was also equipped with about $2,000 worth of driver-assist and semi-self-driving tech, which I had previously explored on a BMW X7 SUV. I avoided the parking assistant and the traffic jam assist (the former is iffy, while in the case of the latter, I didn't find myself in any jams). The surround view 3D camera is cool however, providing a bird's-eye view of the vehicle when maneuvering.
If you're one of the few and the proud and the brave who might be in the market for a real GT car, the BMW 850i should OF COURSE be on your shopping list. To answer the question of whether it's worth $126,395 ... if you have to ask, you're kind of missing the point.