I guess that Intel will tailor the 13xxx CPUs to different power needs: from the most demanding, power hungry, 13900k variant that will certainly change all it's power savings for higher clock rates and/or longer durations of PL2 states, to an i5 or i3 variant tuned for power efficiency, at the cost of highest turbo frequencies.
If the rumor mill is to be believed, Raptor Lake will be built on an improved Intel-7 process (some sort of 10+++ nm process), while Zen4 is supposed to be on TSMC's 5 nm process. That's of interest as Zen 4 will supposedly come out late 2022, as is Raptor Lake. These two will compete with each other directly, so Intel's power savings through its voltage regulator may become partially offset by a 5nm process node that will improve power efficiency in Zen4 by at least 20%. Moreover, AMD is certainly not sitting and doing nothing beyond transitioning to 5nm. Instead, they will most certainly have found some architectural changes that would improve power savings even further.