He doesn't shave his goatee, so Murray Carter won't listen to him(just kiddin, MC), but this guy does a bada** demonstration. I wrote an article about this very thing recently, I would have loved to have had this video to prove the principle!
If you can shave with obsidian, and nobody uses kitchen knives made from obsidian(for good reasons), then shaving is not a good indicator of a good kitchen edge.