Wow! So this RK3588(s) boards (already available since around a year) like a Orange Pi 5 (LTS) easily sacks the not yet avaialble RPi5 in terms of efficiency even though they have double the cores (might be because of them actually big.LITTLE) 
Beside RK3588 can offer M.2/NVMe it is - other than the Raspberry Pi 5 - based on a (more) recent lithography with 8nm and obviously outperforms the Pi releasing a “new” 16nm based process node (BCM2712) in the end of 2023 
Overclocking and *Underclocking* the Raspberry Pi 5 | Jeff Geerling
Not yet released and already outperformed by older SBC’s which don’t cost even more 