This is an example of depth-of-field. This photo probably has a wider aperture causing the barb wires to have a shorter depth-of-field, thus the reason for the soft look around the photo. http://photoaffiliates.com/learning-photography-introduction-to-aperture-and-depth-of-field/
HOW APERTURE WORKS: When an object is in focus, light rays originating from that point converge at a point on the camera's sensor. If the light rays hit the sensor at slightly different locations (arriving at a disc instead of a point), then this object will be rendered as out of focus -- and increasingly so depending on how far apart the light rays are. The lens with the larger aperture therefore has a smaller distance range over which objects reaching the sensor will remain in focus.
To get tack sharp images, one element you need to be aware of is your Aperture. Aperture controls the depth of field - in other words, how much of your scene is going to be in focus. A smaller F number means you will have a smaller depth of field (less in focus) and a bigger F number means