Sadly more and more modern thinkpads come with soldered RAM, which IMO is a deal breaker. Work gave me an X1 Carbon Gen 13 to use, which was indeed both shockingly fast and lightweight, but had soldered RAM and a mobo failure in the first 3 months, so I kept looking for a personal device.
Ended up with a Thinkpad E14 Gen 7 with a Ryzen 7, SODIMM ram and built like a tank. Also much cheaper than the X1. It's heavy, but I'm also not worried about it getting thrown around in my bag.