While I respect your opinion and everyone else's here, my view is a tad different, so I will respectfully disagree. The coachbuilders of yesteryear did not have to contend with crash testing cars, safety regulations, etc. So today's coachbuilder is limited in what it can do...bumpers and lights must stay in exact position, pillars and structure can't be changed. In the past, I could mount a porcelain bathtub on a chassis and it could be sold as a roadgoing vehicle. So, today it is harder to coachbuild away from underlying structure. That said, I also disagree that the Latigo isn't far from the M6. Compared to the Mercedes you mentioned (which kept doors and roof the same), Fisker has replaced every body panel. Look at the two photos below comparing the M6 and Latigo. While the changes may be subtle, every design element was thought out. Note how the crease down the side is lifted up on the Latigo, running straight through the door handle line and extending farther back, all teh way to the rear lights. Note how the trunk looks elongated and softer, and how the rear lower panels are smooth and integrate the bumper with no bumper sticking out. See the lower rocker panel that does not turn upward, creating a straighter looking car. Note that the hood creases gives a sharper angle to the front and amkes the car more pointy and less snub-nosed. It all comes together to make the car look sleeker (IMO), more elegant, and according to many auto journalists, slightly more Italian looking. Fisker never was trying to make a "better" BMW, they just used teh excellent underlying architecture tto build their own coupe. Its not supposed to be better or worse, just diffeernt, and an interpretation of the designer's own style. Also -- unlike some coachbuilders of the past, the entire enine has been rebuilt on the Latigo. And finally, look at the last photo below of the 2012 BMW M6 and try to tell me that you DON'T see a few of those Fisker Latigo design cues now being used on the M6 (rocker panels, crease, pointier hood, etc).
You may have missed this due to my inherent subtly and lack of vitriolic response to people bashing my car, but to be more clear - its my car collection and my garage. Look to the left now in my profile/sig. I also post as Dave_Car_Guy on Datsun, Porsche, Ferrari, Aston, and BMW forums.