There is a big jump in concentration and density in the 2004 Pedro Ximénez de Sacristía, and looking at the analytical data, it's also the one with more sugar and acidity, so something happened here... It's really dark and dense, oily, notably different from the 2006 that is only two years younger. It has more depth and complexity, the aromas feel less sweet, and the bitter notes appear—roasted coffee, bitter chocolate... 582 half bottles were filled in 2017.