2007 BMW M6 Convertible vs 2007 Mercedes-Benz SL65

Its not easy to compare the 2007 BMW M6 Convertible and the 2007 Mercedes-Benz SL65 AMG. The whole idea teeters on the brink of the ridiculous.How relevant is a comparison of a $108,795 BMW M6 to a $189,375 Mercedes SL? With about a thousand M6 co