The 840i is the cheapest version, but it’ll cost you more as a cash buy than the cheapest Mercedes CLS or Audi A7 Sportback. The 840d is marginally more expensive, while the M850i is a whole different ballgame and more closely aligned on price with the Porsche Panamera.
As yet, there aren’t any PCP finance figures for the Gran Coupé, so it’s impossible to compare costs if you choose that route. Inevitably, though, it won’t be cheap.
All three engines pump out enough CO2 to land them in the top bracket for benefit-in-kind (BIK) company car tax, but the 840d should be the cheapest to fuel, with a WLTP combined average of 39.2mpg. The official 33.2mpg for the 840i isn’t bad, either, but the M850i will struggle to break out of the mid 20s at best.
You get lots of goodies as standard. In the 840i and 840d, these include front and rear climate control, power-folding door mirrors, 19in alloy wheels, an electric bootlid, keyless entry and heated seats front and rear. Options are plentiful, too, and include soft-close doors and cooled seats. The M850i has larger, 20in alloy wheels and adds a sports exhaust.
The Gran Coupé hasn’t been crash tested by Euro NCAP, but it does get a good crop of safety features, such as automatic emergency braking (AEB) and lane-keeping assistance. Blindspot monitoring is optional.
BMW finished a relatively lowly 21st out of 31 brands in the 2019 What Car? Reliability Survey. That’s one place below Audi but above 23rd-place Porsche and 24th-place Mercedes. The standard warranty is three years, with no mileage cap.