It's impossible not to fall in love with the 2004 San Leonardo. This may well be the greatest wine made by the estate (equal to the delightful 1990) thanks to the infinite, ever-shifting complexity on display. It's hard to know where to start: Bright fruit aromas segue to spice and leather and then segue to cola and balsam herb. Blue flower and button mushroom also make brief, but meaningful appearances. This iconic vintage started with a wet spring and moved forward to a dry, warm harvest period. Give the wine another ten years to find its footing. If you serve it in the near term, allow three hours for decanting.