I have 2 relatives who have died of Parkinsons. I never once saw either of them as bad a MJF was in his commercial.
I had a relative pass away recently from Parkinson's. I also had a close friend pass away recently from cystic fibrosis. My relative was in noticeably worse shape than Fox is now, even when Fox is not on medication (or overmedicated). Some people are afflicted worse than others. Fox appears to have average symptoms, although he seems young for the symptoms to be as progressed as they are. My friend with cystic fibrosis was far worse off than any case of Parkinson's that I have seen.