I'd wait for actual benchmarks just judging by the amount of parachute clauses in the disclosures. Power consumption numbers should be great but I'm guessing it falls flat on some compute tasks that can't leverage custom instructions.
"Apple claims the M1 to be the fastest CPU in the world. Given our data on the A14, beating all of Intel’s designs, and just falling short of AMD’s newest Zen3 chips – a higher clocked Firestorm above 3GHz, the 50% larger L2 cache, and an unleashed TDP, we can certainly believe Apple and the M1 to be able to achieve that claim."
Not sure what the custom instructions you're referring to are.