Without being hands on, it's difficult to make a direct comparison. There's 2 processors according to CNX [0], and the HP core's instruction set might roughly be comparable to M55.

[0] https://www.cnx-software.com/2026/03/24/esp32-s31-dual-core-...

Don’t know the specifics of the Espressif RISC-V cores, but in general they can’t really compete on those aspects with ARM.

ARM is a much more mature platform, and the licensing scheme helps somewhat to keep really good physical implementations of the cores, since some advances get “distributed” through ARM itself.

Compute capabilities and power efficiency are very tied to physical implementations, which for the best part is happening behind closed doors.