This is probably better suited for the lens forum but what the heck........Even though I had been a 35mm film guy for many years, and Canon as well of course, I sold my film gear to fund my purchase of of my first digital camera, a Canon 10D several years ago. After feeling I needed to update a couple of years ago, I decided to go with a 7D. Again, another crop body. A great camera no doubt and I love it. Now, I just bought a 5D2 and it's been quite a little visual reaquaintance with looking through a lens actually designed for FF and adjusting back to where things were visually before crop cameras. My 16-35mm 2.8L Mk2 is just wow on my 5D2 while on my 7D I thought is was almost just barely adaquate for a WA lens. My 24-70 is also great on it as well. My 70-200 will probably be living on my 7D with the other two reserved for the 5D2.