If your on a crop camera, I highly recommend the 24mm 1.4L II. On the 7d, it is a 35mm and on the 5D is a 24mm so if your really cramped, you can swap the 24 on the 5D and the 50mm on the 7D. Id get the 50mm 1.2L over the 35mm 1.4L. I just prefer the look, and ive never experienced the famed focus shift or AF issues.