I've had very good past experience using the DNG Profile Editor to generate profiles for a Canon 1Ds, 20D, and 40D. Now I have a new 5D Mark II, and the first profiling attempts have been poor. The Adobe Standard and Camera Standard profiles for the 5D Mark II seem much better than my custom profiles.
My profiles are making much darker blues, much lighter and desaturated reds, and some strange yellows. I'm plagued by blowing snow and dark gray skies now, so finding good light to shoot the MacBeth color checker is a challenge. Thus my initial attempts have been indoors with incadescents, bounce flash, and studio strobes.
Looking for others with the 5D MarkII who have profiled. What is your experience?