I have made a few essential Styles for Capture One that does minor adjustments to the Leica files, so as to get the tones the exact way I want.
The Styles has as their ideal, the Leica M9 sensor , as well as the Kodachrome film (which also happened to be the ideal for Leica when they developed the Leica M9 sensor). Not that it matters much, but that is the reason why I made my own Styles: To get the that look, rather than a “digital sensor look”.
"Overgaard Leica Styles"
Capture One Styles Package
Capture One Pro