Alfa Romeo Giulia (2018) is 265 mm (10.43 inch) longer, 73 mm (2.87 inch) wider, 143 mm (5.63 inch) higher and has 288 liters (10.17 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 79 kg (174 lbs) lighter than Alfa Romeo Giulia (2018).