The always entertaining Kai from DigitalRev TV takes to the streets, armed with 3 different models of Canon 50mm lenses: The 1.8, 1.4, and 1.2L. Using phrases like "sphincter twitching" and "buying meth", he colorfully illustrates his points about choosing the right lens based on your budget and compares the look and feel of each model.
I've used the two models on the cheaper side of things, and agree with Kai's feelings about the plasticy feel of the 1.8. Automatic focusing is slow, and manual focusing is awkward with the placement and feel of the focus ring. The 1.4 has a heavier feel and stronger build to it, so I always will go for that (unless a friend wants to borrow a 50, in that case I share with them the 1.8!)
If you're still doing some research and trying to decide which 50mm to buy, try out this tool from the Digital Picture to compare lens models.
Which 50mm do you prefer? Have you ever really needed 1.2 over 1.4? Share your comments below.