I would choose BMWs over Mercedes and other equivalent cars. Having said that only cars I would drool over this one are BMW M5 and M6. I got this car with full option and everything ranging from parking distance control to cold weather packages, all very useful. If you hear people complaining about the BMW iDrive system, don't believe them. Unless you are very old- fashioned and don't know how to use a computer, you won't have a problem with the iDrive function. This car has a surprisingly big trunk and back seats are plenty for people under six feet tall. This car drives like a Porsche 911 but it can also be driven like a luxury sedan so it's lot more practical for everyday use.
Navigation system is awesome and it allows you to go anywhere without getting lost. Also the engine makes a beautiful growling noise when you accelerate fast kinda like a GT muscle car but unique in it's own way.
The back seat is not foldable for a trunk access it should fold down. The sun roof only tilts up and it should be redesigned so it actually slides opens all the way. Back seat is too upright and this should be less steeper. There should be only one model for this car which is a hardtop convertible.