GFXBench 5 results of the Apple M1 Max indicate that raw performance may really not match up to an RTX 3080 Laptop GPU, though there are likely benefits when power consumption is factored. The early results show that the M1 Max is probably more on the lines of an RTX 3060 Laptop GPU than an RTX 3080. However, it all depends on the type of benchmark considered and there's no definitive conclusion just yet.
https://www.notebookcheck.net/Geek-discretion-advised-Apple-M1-Max-trails-behind-RTX-3080-Laptop-by-nearly-30-in-GFXBench-but-is-about-8-faster-than-RTX-3060-Laptop-mileage-varies-depending-on-considered-benchmarks.574178.0.html