There's a Thinkpad E495 (previous-gen Ryzen/Vega) review on notebookcheck. The "E" series (fka "Edge") is a budget notebook though; for example, it uses slower memory and doesnt't have keyboard lighting/fingerprint sensors. I can confirm an E495 works perfectly with Ubuntu 19.10 OOTB; not sure the newer Ryzen is already fully supported by Ubuntu 20.04 LTS coming out these days.