HOW IS MERCEDES-BENZ’S new California advanced design studio coming along? Not well, if Joel Piaskowski’s sudden move from the studio (he was its chief) to Ford in Dearborn is any indication. Piaskowski is the highly talented designer whom Mercedes lured from Hyundai in January 2008. On October 1, he went over to Ford, where he reports to executive design director Moray Callum. From 2003 to 2008, Piaskowski was head of Hyundai’s California design studio, where he led work on the Genesis coupe, Sonata, Tucson, and concepts HCD8, HCD9 Talus, and HCD10 Hellia. He was key in transforming Hyundai’s image from cheap and dowdy to aspirational. Piaskowski began his career in the late 1980s at General Motors, working on Chevy, Pontiac, Opel/Vauxhall/Holden, and Buick, as well as GM’s old Asian partners,…