I think the F12 650i is real close for being an all around car. It's fast, comfy, sporty and full of tech. It handles pretty good for a car its size but it is that size that keeps it from being what I call the best all around car.
I'm going to choose the Infiniti G37. It's sporty, decent power, comfy and handles better than current Bimmers. Not Bimmers of the past but better than the current crop. Plus it's more economical which helps with a car being considered an all-arounder.