I have used Darktable quite a lot with my Sony a7r3. There is a learning curve after years of Lightroom though. The final look is softer and more film like in my view to the ‘commercial’ raw developers but maybe that is just how I learned to use it. It is a very powerful tool with many ways to do selective editing. You can even get it to send a tif to affinity or another external editor if you download the lua scripts. I stopped using it because it won’t recognise my x-pro3... and I just got capture one at 55% off.
If or when I get back to using it again, I would miss the film simulations of C1 even if most of the time I edit the jpg from the camera.
If there are any questions about Darktable, I’ll try to answer them.
Cheers,
Nicolas