An unusually diverse and uniquely daring assemblage of 13 automobiles challenged assumptions and presented our judges with the dilemma of choosing a clear winner during Robb Report‘s 22nd Car of the Year competition. The contenders comprised the Aston Martin Vanquish Volante, Audi RS 7, Bentley Continental GT V8 S, BMW i8, Cadillac ELR, Ferrari California T, Jaguar F-Type R Coupe, Kia K900, Lamborghini Huracán LP 610-4, Maserati Ghibli S Q4, Mercedes-Benz S550 AMG 4-Matic Coupe, Porsche 918 Spyder (above illustration by Mike Kim), and <a href="http://robbreport.com/slideshow/automobiles/robb-report-2015-car-year/7" style="text-decoration:none; font-weigh…