I left C1 for darktable one year ago.
I have darktable installed on Windows 10 and (for development purposes) on Ubuntu Linux.
On Linux it is slightly faster but, if you have a good graphic card with OpenCL, not by much.
UI and stability have been improved a lot on Windows in the last releases.
It is also one of the not so many FOSS that fully supports HiDPI screens on Windows (unlike RT or GIMP for example).
Integration with external editors like GIMP can be added with lua scripts, there is a nice script installer now. You can try “edit with GIMP” or my script “ext editors”. With that you can configure as many programs as you like and do round trips with DT.
Like you, I initially missed the sharpening/clarity/structure thing in C1, although when I go back to old C1 edits now I find them way oversharpened and unnatural.
Having said so, a true capture sharpening feature is missing in DT, but it can be mitigated by using the contrast equalizer wisely. See here.
Also C1 applies output sharpening to jpgs by default. DT doesn’t have this feature natively, but againg it can be added with a lua script, for example “RL_sharpen”.
Good luck.
Marco
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