For a while now specific providers (Security Scorecard, BitSight) have provided security benchmarking for a client's ecosystem / vendors.
While that is great, these algorithms have been generic in nature versus taking cloud security nuances (i.e., AWS S3 utilization) into consideration.
To fill that gap, cloud service providers (CSPs) have now added their own benchmarks (e.g., AWS Trusted Advisor, Azure Secure Score) that will baseline a specific account versus the entire cloud ecosystem.
One would think that partnerships, maybe in conjunction with the Cloud Security Alliance's (CSA) Security, Trust & Assurance Registry (STAR) program, would allow cloud consumers to provide a holistic view of one's security maturity.