I own the 85mm f/1.8 and have used it on the 7D, but I haven't used it much. I *almost* used it today, but I was too lazy to fish it out of my other camera bag. The 85mm f/1.8 is indeed a fantastic performer. Here's a shot using the 85mm f/1.8 at f/3.5.






To be honest, the 85mm f/1.8 was the first lens I ever purchased. At the time, I found the prime to be too long (for indoor use, especially) and decided I wanted the convenience of a zoom. I sold the 85mm prime to help fund the 17-55mm f/2.8 IS. Fast-forward about 3 years and, after owning three really good zooms and a couple of primes, I began to miss the capabilities (and quick, accurate AF) of the 85mm. In my mind, it's not a great general purpose lens (I personally prefer a zoom that covers a shorter focal length); however, it's a fantastic lens for the price and one of the best economical "second lenses" I can think of.