"How high-end is (it)?" Not high enough. I got suckered into getting this because Mini-Led was supposed to provide me with an amazing viewing experience, and because I got a 25% discount on the laptop. The screen sure was fantastic in video games or movies, until you tried to do some colour accurate work or put a dark theme on. The blooming is atrocious and abysmal. White text and the white mouse cursor all become grey on a black background, as if a yawning abyss swallows them. The "main attraction" is thus a complete bust; and if you can't work properly on your new top-spec £3000 machine, you should really reconsider your decisions.
The performance I got under load was decent, but who cares? When I tried using the laptop normally for a day, just watching youtube caused the fans to turn on noisily and the CPU temps to start climbing to 70+ degrees. That's got to be a joke of some sort. I can cope with the lowest fan setting on a laptop, where they're on but they're barely audible, but having your laptop push above 40 dB while you're just watching a video is not a good thing. If you have to undervolt and underclock your new top-spec £3000 machine, fiddle with fan curves and TDPs and wattages just to get it to behave like a normal laptop, you should really reconsider your decisions.
I have no idea how the reviewers got 4+ hours on battery. The final nail in the coffin for this waste of potential was that watching my youtube vids (20% screen brightness, ~30% volume, quiet mode with custom fans in Legion Toolkit) got me 1h 45min before the 15% battery warning. I forgot to turn the refresh rate down to 60, but I doubt that would have made a great difference; and if you have to turn down the refresh rate on your new top-spec £3000 machine, you should really reconsider your decisions.
What a waste of a cool aluminium chassis. The build quality is really nice, and though I hate "gamer" s*** on my laptops, the "forged carbon" is neat and comfortable to the touch. The ports are just terrible though, so even this one aspect that I kind of like isn't very good. Returned for a Legion Pro 7i... which I returned as well, because it refused to boot on the second day of use. I am not going to be touching Lenovo products again, at least for the foreseeable future.