Infamous for being difficult to grow, Sangiovese is seldom the favorite of farmers indebted to banks. There's very little of it in Napa Valley, a place where nearly every (other) grape variety thrives.
Villa Ragazzi is among the few to have good luck growing Sangiovese in Napa Valley. It could be the Rodeno clone, it could be our soils or the microclimate -- we don't know. But our small crops of intensely flavored fruit make wine that remind some of Brunello.