As Mercedes-Benz's most compact crossover in the U.S., and the first smaller utility from the brand to reach our shores, the GLK Class is only three model years old, competing with the BMW X3, Acura RDX, Infiniti EX, Audi Q5, and Cadillac SRX. Updates for the 2013 model year include a new diesel engine. Roughly the same size as the compact C-Class...