Pretty hot topics here. I think I know what the OP is talking about and I agree with many people who replied. Lens and techniques are important to get the good inputs before PP.
One thing I havent seen mentioned is the resizing techniques. I have seen similar photos with this kind of razor sharp clarity. Obviously similar question was asked, the photographer explained a multiple stage resizing techniques whereby the origninal image is resized slightly smaller each time and sharpen after each resizing. This way, the edges / outlines get progressively sharper as you downsize the image. If you try to downsize this in one stage, then edge / outlines remain "fat" so you canot really get that punchy look. Its a trick for the "pros" it seems.
Implentation wise, this is usually achieved by creating an action in Photoshop where all the stages of resizing is done automatically. I haven't done this myself as I seldom use images of this size, but one of these days I will try it.