Edmunds: Cadillac CT4-Blackwing vs BMW M3 sport sedan battle


              This photo provided by BMW shows the BMW M3, a small luxury performance sedan with a 473-horsepower turbocharged six-cylinder engine. It offers the option of all-wheel drive and a zestier 503-horsepower engine. (Uwe Fischer/Courtesy of BMW of North America via AP)
            
              This photo provided by Cadillac shows the Cadillac CT4-V Blackwing, a small luxury performance sedan with a 472-horsepower turbocharged V6 engine. It provides excellent performance value for the money. (DW Burnett/Courtesy of General Motors via AP)
Edmunds: Cadillac CT4-Blackwing vs BMW M3 sport sedan battle