I'm actually using the newest Aperture for serious deadline work. Surprisingly, it's become light years faster than Lightroom 4 in several areas, especially for imports. It has several portrait tools that are stellar and are not part of Lightroom, plus the UI makes Lightroom look like a clunky monster. I still use Lightroom for color matched jobs since one plugin doesn't work in Aperture.
Sent from my iPad using Srs Cmpcts