You could possibly compare this to an M6 or a CLS55(or even 63) AMG. The badge is what separates this from the other two. Lamborghini did not have a competitor, and McLaren's only car in production was a supercar. The 612 is not a supercar; the SLR is a competitor to the 575M Maranello (people keep comparing SLR to Enzo, but that's incorrect; but, in terms of age, closer to the 575M Maranello than to the 599 GTB Fiorano).
Edit: Another thing, as the boat of all coupes, the Bentley Continental GT would be a competitor to the CL (no "-S") 55-to-65 AMG cars and their 600 trim sibling.
