Gone is the vanilla styling of the old CL; Mercedes’ swoopy new S-Class Coupe truly defines ‘gorgeous’, writes Road Test Editor Howard Walker. Maybe it’s the 47 Swarovski crystals in the headlamps. Or the glass roof that goes from clear to dark at the touch of a button? Or the total, utter jaw-dropping beauty of its lines? Trust me, Mercedes-Benz’ new S-Class Coupe is traffic-stopping stunning. This new Benz flagship-of-the-fleet has its world premiere at next month’s Geneva auto show - yes,...