To draw a conclusion, if you want a high-performance but portable PC, the ASUS ROG Strix Scar 18 is a great option. Maybe the best one at the moment. On the other hand, prices for laptops with RTX 4090 are high. 4000, 4500 euros for a laptop it's a lot, even if the laptop in front has no big negative points. At the same time, pre-made desktop systems with RTX 4090 are just as expensive. But that one will have a performance boost over this laptop, but it won't be portable.