The last lens I think I was excited about was probably the 500PF for many of the same reasons (although, no VR). Since the 500PF, I've had multiple exotics, including the outstanding Sony 600mm and 400mm GM lenses as well as the Canon 600 F/4 (iii). All nice glass, but they essentially are just better versions of what was there before. However, the PF versions - this 800mm in particular - actually changes how I shoot and what I can do in the field. The 500PF did, but it was a bit shorter and slower than I like at that focal length. This lens though is an even more dramatic change, at least for me.