Mercedes S-Class (2020) is 495 mm (19.49 inch) longer, 79 mm (3.11 inch) wider, 2 mm (0.08 inch) higher and has 45 liters (1.59 ft3) bigger cargo space than Peugeot 408 (2020).
Peugeot 408 (2020) is 725 kg (1,598 lbs) lighter than Mercedes S-Class (2020).