I now have a Samsung Galaxy Book Pro 13 which weights only 868 grams. Unfortunately it‘s only the variant with the i5 and soldered 8GB RAM, because the variant with the i7 and 16GB RAM is no longer available and even nowhere in stock in the German DACH area. But I have already planned a BGA soldering upgrade to 16GB or even 32GB RAM by an expert in the field, where I am currently looking for someone who can do this for me. That means desoldering the old LPDDR4X RAM chips and soldering the new LPDDR4X RAM chips. Unfortunately BGA soldering is only possible with a professional infrared soldering device and the required skills to handle the soldering on the small scale of the chips.
At the very least, the Samsung Galaxy Book with the i5-1135G7 beats my Thinkpad T480 with the i5 8250u and 32GB of RAM hands down in plain CPU performance, for the simple reason that the Samsung notebook simply throttles less often, if at all, whereas the Thinkpad T480 throttles frequently, if not almost always, and that's despite the fact that the Thinkpad T480 is thicker, heavier, and actually has a more powerful heatpipe. From this I would say that Samsung is clearly better than Lenovo when it comes to power management and waste heat management.
In addition, the Samsung Galaxy Book Pro 13 weighs only 868 grams and the Lenovo Thinkpad T480 with the thicker battery weighs a whole of 1.8 kilograms in comparison.
And all the USB-C and Thunderbolt docking station stuff from the Lenovo Thinkpad T480 works just fine on the Samsung Galaxy Book Pro 13, except for the dock's power button, of course, since it's a proprietary Lenovo over USB protocol thing. The Samsung Galaxy Book Pro 13 even has an advantage regarding the eGPUs, since it has Thunderbolt 4 with four PCIe lanes. In contrast, the Lenovo Thinkpad T480 only has Thunderbolt 3, which is only equipped with two PCIe lanes.
And the Samsung Galaxy Book Pro 13 has a very good AMOLED Full-HD screen including HDR, AdobeRGB, P3, sRGB and so on, where black is really black without any visible remaining backlight, because there simply is no backlight. Sadly it's also glossy. But well, one cannot always have everything at the same time. :-)
I am satisfied with the Samsung Galaxy Book Pro 13 so far, except for the fact that it only has 8 GB of RAM. Windows is constantly swapping memory around, Chrome is constantly reloading tabs, and so on. Therefore my wish to Samsung would be: Please include more RAM from the beginning, even in the lower model variants! Because 8GB are really not up to date anymore (except for maybe pure office work and social media stuff).