I admit that I'm an odd applicant, but without the CV i included neither of the schools I applied to would have clearly understood how I've spent he last forty years, which included a Fulbright to England, a long career in business management, election to public office, starting a 100-store retail chain, writing a popularly published book, and service on several nonprofit boards. If I had tried to cram the specifics into the SOP it would have run ridiculously long. I didn't ask whether to include the CV; I just added it on and referred to it in my SOP.
As for results, I gotinto one of my two choices and not the other, though after I applied to the second I was told by the lead POI that they were no longer accepting new students in Medieval History, so I'm unclear on whether I would have been accepted if the specialty were ongoing. In any case, the CV certainly didn't hurt, and it allowed me to write a SOP which focused on where I want to go rather than where I've been.