INDIANAPOLIS — Since the mid-‘50s, Mercedes-Benz sports cars have been some of the most desirable in the world. We’re talking about the 300SL “Gullwing,” McLaren-developed SLR, SLS AMG “Gullwing,” and now, the AMG GT-S. All have been sexy as sin, but from styling to technology, the latest takes the three-pointed star to different tracks.