I have several that I'm working with - here is one, apologetically simple. M8 files don't need a lot of work, at least for what and how I shoot.
First, RAW conversion
1. open dng in capture 1.4
2. adjust wb and exposure (note: my M8 is usually set to EC of -1/3 to -2/3)
3. select JFI profile (liking Tri-x lately)
4. process and save as tiff
Second, in PS:
1. open tiff file and crop a/or straighten, if needed
2. fine tune general and micro contrast (tool and degree depend on subject)
3. apply other tools as needed, e.g. dodge, burn, fall off, etc
3. add film grain to taste
4. USM - usually fairly mild, around 100/0.4
I would like to try the Silver Efex profiles at some point, but I'm liking JFI's for now. Most of the M8 shots in my RFF gallery were converted using the above method, or very close to it.