Not the best article but similar results to the 2011 GT vs M3 comparison Motor Trend did.
http://www.nydailynews.com/autos/latest-reviews/ford-mustang-gt-bmw-m4-article-1.2194288
http://www.nydailynews.com/autos/latest-reviews/ford-mustang-gt-bmw-m4-article-1.2194288