It is possible to calibrate Leica M8 for Adobe Lightroom or Photoshop Camera Raw by using a color checker (these can be found by GretagMacBeth XRite or QPCard) and a script made for Adobe Photoshop. All the details to install and use these scripts can be found on the excellent Rags Gardner Web Site.
I made the test by photographing the color chart under calibrated light (flash) with a M8 firm. vers. 1.110. Summicron-M 75mm with and without UV-IR filter. Here are resulting Hue and Saturation values to port to “Camera Calibration” fields in PS Camera Raw or Lightroom. I tweaked this result by adding a Red color correction to get the best skin tones possible.
With UV-IR Filter
Camera calibration : Hue/Sat > Red +4/+4, Green +12/+29, Blue +14/-1
Red Correction HSL : 0,-13,-27
Without UV-IR Filter
Camera calibration : Hue/Sat > Red +4/+22 Green +17/+14, Blue +8/+15
Red Correction HSL : 0,-15,-30