mmh... i wouldn't call this blurry or unsharp - the resolution is low, but anyway...
reflective materials need something to reflect to look good/realistic. In your picture example it's only the skylight that is reflected and the only object that defines the reflection in the tutorial image is the person standing on the left. In your image this reflection is also there, but it's only slightly visible on the border of the image and your material is less reflective. The preview scene has a frontlighting which produces stronger reflections, but even there you get not much reflection. Without knowing the other values i would say at least, that lowering the bump value will give you more defined reflections. I think your bump value is much too high with 73%. Normally you should keep it below 30%. A too high bump value will darken the material and can produce unrealistic results. If you need strong bumps it's better to use normalmaps or displacement.
