Sample pictures have been added to these reviews: Canon EF 500mm f/4.0 L IS II USM Lens ReviewCanon EF 600mm f/4.0 L IS II USM Lens ReviewCanon EOS-1D X Review
(with some overlapping samples)
These are awesome lenses. I expect to post many more sample pictures from these lenses in the future - especially/hopefully after a White-Tailed Deer photo trip I have scheduled in Shenandoah National Park in the near future.
The 1D X is also awesome. I'm deep into my fall sports photography season and can easily say that I've never had a camera and lens combination perform as well as the 1D X and the "IS II" supertelephoto lenses. These combinations rock.
Note that I continue to include photography tips in most of the sample picture comments.