I finally bit the bullet and bought the Canon 50mm f/1.4 lens. I've been shooting with the Canon 50mm f/1.8 lens since 2009. I'm so, so happy to upgrade! I had to sell my Canon 35mm f/2 lens to fund it (wasn't a huge fan of it) - but I couldn't be happier! As soon as it comes in, I'll be selling my old 50mm lens (that I used to take these pictures with). Some day, I'd also like to buy the Sigma 30mm f/1.4. You know, when I find a spare $500 laying about.