Contrary to popular belief, the SLS AMG was not a direct successor to the SLR McLaren. The SLS AMG didn't have any direct predecessors and was a retro-design of the 300SL Gullwing.
The SLR McLaren had no direct predecessors either, and like the Carrera GT (but unlike the Enzo), it offered the exact same performance as its homologated predecessor in a higher-fat body.
The SLS AMG was basically a German version of the Ford GT and Dodge Viper, but without the supercharger or the V10.