They don't look similar at all. The McLaren is the most bland looking supercar ever and a big disapointment designwise. Looks like it's designed by a man who wanted a 360 Modena but could only afford a Lotus Elise. Then he got depressed and a Peugeot designer that retired in the 1990's designed the rear.... The 458 is on the other hand alomost revolutionary: The head lights, the flexible front wings and the clean side profile withour air intakes.... Well done...