The sharpening is something digiKam does.  LensFun has nothing to do
with it.

 The black borders are correct.  The image just needs to be cropped
afterwards.

 I'm about to do the calibration of this lens but haven't finished
yet.

 Your observation that the correction is wrong for close-up pictures
may point to a serious problem: The distortion parameters are
distant-dependent.  Could you please also upload a macro image (e.g.
of a piece of paper with straight edges) at 18mm of focal length?
Thank you!

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