Look here https://www.youtube.com/watch?v=HRI2NiaX3_8&t=3363s 53min.
Here is original raw file vs dng file from DxO PL (or PureRAW).
Problem is with sharpness.
CaptureOne treats dng file as normal raw file and aplies all pre-settings, initial sharpening too.
Sharp dng file + initial sharpening gives big oversharpness.
Pay attention to this phenomenon and do something (any tutorial, comment)