Yes, sure https://www.sap.com/products/erp/s4hana.html It's quite nice, even though they do some crazy (also cool) stuff with it https://blogs.sap.com/2021/09/30/steampunk-is-going-all-in/
How common is „three system landscape“ in cloud, like S4HANA? Elastic scaling? No. TCO footprint of an new tenant? Sigh.
I've not yet used S/4HANA Cloud (only the on-premise version), but it looks to me like it's just a hosted version of standard S/4HANA but with various restrictions on what you can customise etc. No real elasticity, cloud scaling, etc. SAP ERP has been multi-tenant since at least R/3 in 1992 (I never used R/2) so "Cloud ERP" smells to me like "we host it for you and call it cloud".
Yes, I am rather cynical at times.