Sleek, luxurious, beautiful, the newly introduced BMW Gran Coupe is a non sequitur of a car that joins the Audi A7, Mercedes-Benz CLS, Porsche Panamera, and Jaguar XF in the four-seat executive sport sedan category.

The Gran Coupe is a four-door take on BMW’s 640i two-door coupe. It seems to have married the front end of the 6 Series two-door to the 5 Series’ longer wheelbase and sportier roofline. BMW designs so grandly that it borders on the surreal, and the Gran Coupe’s stunning good looks are closer to art than transportation. Some say it might be the most beautiful car made, an amour fou.

The Gran Coupe has a wonderful, if not understated, architectural-quality interior: luxurious leather stitching, sweeping angles, and beautifully detailed operating controls, design, and cabin lighting. The deep cosseted sport seats hold you in place on twisty canyon byways, and there’s a staggering number of both standard and optional technology features.

The Gran Coupe comes in three models: the BMW 640i, the BMW 650i (with a more powerful 4.4-liter twin-turbo, 445-horsepower V-8), and the BMW 650xi all-wheel drive (powered by a 400-horsepower version of the 4.4-liter V-8).

Our test 640i was powered by a 3.0-liter inline 6-cylinder that makes 315 horsepower and is mated to a new eight-speed automatic transmission. It easily propels this large car from 0-60 in just 5.4 seconds and has an electronically limited top speed of 155 mph.

The Gran Coupe also comes with what BMW calls Efficient Dynamics Measures, which include Brake Energy Regeneration and Auto Start-Stop that shuts the engine off at stoplights and re-starts it again when you release the brake. There’s also extensive aerodynamic refinement that contributes to efficiency and fuel economy.

Overall the Gran Coupe is a fantastic car both behind the wheel and in visual appeal, but by the time you tick all the boxes for optional equipment, it can easily exceed $100,000 — definitely priced for an executive pocketbook.