You can run Linux on a MacBook Pro and get similar power efficiency.
What? No. Asahi is spectacular for what it accomplished, but battery life is still far worse than macOS.
I am not saying that it is only software. It's everything from hardware to a gazillion optimizations in macOS.
It’s worse at switching power states, but at a given power state it is within the ball park of macOS power use.
The things where it lags are anything that use hardware acceleration or proper lowering to the lower power states.