Of course you can get a knife that sharp. You can get anything flat that sharp. But when you make things that sharp they don’t hold an edge for very long, so it’s not a practical angle for a survival or bush knife. General use pocket knives are usually sharpened to an angle of about 24 degrees, and a straight razor is usually around 15 degrees. Since the leading edge is much thinner, it has to be resharpened and honed much more often and is not suitable for cutting hard objects like wood, or in the case of swords, bone.
Of course you can get a knife that sharp. You can get anything flat that sharp. But when you make things that sharp they don’t hold an edge for very long, so it’s not a practical angle for a survival or bush knife. General use pocket knives are usually sharpened to an angle of about 24 degrees, and a straight razor is usually around 15 degrees. Since the leading edge is much thinner, it has to be resharpened and honed much more often and is not suitable for cutting hard objects like wood, or in the case of swords, bone.
So whenever some Cowboy or Ranger shaves with a survival knife, it’s just proof that knife never saw any action.
Or that he sharpened it for shaving right before shaving. It’s mostly just Hollywood stuff because it looks cool.