No. The Horsehead is difficult even with a 16", a dark sky and the appropriate filter. I've only glimpsed it a couple of times, once in a 16" with the H-beta filter and once in a 17.5" without a filter but a good image of the nebula and surrounding stars on hand as a guide, and even then it was a good case of 'averted imagination'.
Some people seem to see it very easily, I've heard stories of complete novices seeing it clear as day (no preconceptions, I suppose) but I'm an experienced observer and I have always struggled with it. I've also heard stories of people seeing it in smaller scopes.
But whatever you're like, I don't think I'd be buying a 16" just to see the Horsehead (although I could think of plenty of other reasons to do so....)
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