lol id say so but in a wrong way! on the flat part of the blade you can get away with relatively few polys its just getting them to line up properly to the edge part that could be tricky especially as it tapers to a point. there are some good tutorials online about modelling for subdiviison surfaces to make the flow of polys consistent, they are applicable to all 3d packages and come in as best practice for poly modelling in general, i suggest you have a look as if you plan on detailing lots of objects like that your system will start to crawl as your scene builds up - if you are just rendering single object then it doesnt matter so much.

ill try and have a look and see if i can dig up some examples for you

 A cleaved head no longer plots.

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