The third-gen R-Car is further equipped with a “dual lock-step” Cortex-R7 MCU, security and stream engines, plus a more robust boot protection process

Source: linuxgizmos.com

It’s not really just about performance since this chip contains key safety and security features supporting ASIL B internally which enables a Tier1 to comply to ISO26262 ASIL D. This will be the new benchmark for automotive SOCs.