Hyundai i30 (2020) is 163 mm (6.42 inch) higher, 353 kg (778 lbs) lighter and has 195 liters (6.89 ft3) bigger cargo space than Toyota GR Supra (2018).
Toyota GR Supra (2018) is 38 mm (1.50 inch) longer and 65 mm (2.56 inch) wider than Hyundai i30 (2020).