Bought myself a present for christmas: The Canon EF 50mm f/1.4. It's fun and sharp, and the possibility to play with very shallow DOF is very nice. It's easy to make "stack" effects like this.
I've never owned a large aperture lens like this, so it's interesting to see that even though the middle ball looked reasonably sharp in the viewfinder, most of it was in reality out of focus. So it'll be fun to learn how to use this lens optimally.