I was about to post how it's 25% faster than the 5900HX in Blender and that's an achievement, but it takes the 12900HK much more power to accomplish that feat, but I don't think it's a valid comparison here.
In a mobile workstation where power and battery life isn't as relevant as it's being connected to AC power, the 12900HK provides a massive performance benefit over the 5900HK, assuming the performance scales as well in that software as it does in Cinebench and Blender. In a gaming notebook it's a different story as we saw with the ASUS G14.
I'm no fan of Intel, but the fact they're putting this kind of performance in a mobile processor is GOOD for the market and puts AMD at a disadvantage. This also goes back to my post on another topic that I am disappointed that AMD doesn't seem to be raising core counts with Zen 4. I remember seeing articles saying that AMD has patents on the same kind of mixed core strategy Intel is using, but they haven't implemented them in a retail product yet, and AMD may be forced to do that, even if it's just in the mobile market.