After various attempts to replace lightroom I finally gave darktable a serious try. No need to switch to windows anymore! I've mostly been watching Bruce Williams' videos to get going.
I'm using version 3.2.1 under Gentoo Linux. Unfortunately, my camera, the Canon EOS 5D Mark IV, is not yet listed among the supported cameras when it comes to lens corrections. I've found posts about supplying sample pictures, but they seem to date from 2017. If there are any more current instructions, I'd appreciate a pointer.