Hyundai Genesis (Coupe) (2015) is 25 mm (0.98 inch) wider than Mazda 6 (2018).
Mazda 6 (2018) is 265 mm (10.43 inch) longer, 66 mm (2.60 inch) higher, 10 kg (22 lbs) lighter and has 148 liters (5.23 ft3) bigger cargo space than Hyundai Genesis (Coupe) (2015).