Here is a LEICA M PROFILE for Lightroom (done with Color Checker Passport, recently updated to a two illuminants daylight+halogen profile):
On a Mac the file has to be copied to ~/Library/Application Support/Adobe/CameraRaw/CameraProfiles. On a PC I don’t know the location but this shoul be easy to find on internet.
In Lightroom, go to develop mode and to the bottom on the right side pane in “Camera Calibration”. Here select the Profile “LEICA M (Type 240)”.
Try this profile and judge by yourself. There is some difference compared to the “embedded” profile in the Red rendition.