I agree with Sridhar Iyer that the 50mm f/1.2 is an amazing piece of glass.
Always consider the degree of diffusion, sunny, cloudy, partly sunny, partly cloudy as this will effect your range of contrast along with the direction of your light. Cloudy is non directional and the sunny side emphasizes texture.
This combined with the proper software, as others have mentioned, Lightroom, Silver Efex Pro 2, On One Photo Suite etc. All have free trial downloads, at least 15 days and On One is 30 days and the tutorials are excellent.
Be sure to shoot in RAW and try to get the best possible result directly in camera, for that helps the editing process to proceed quicker instead of having to clean up one's mistakes in post.
Simple backgrounds, with a shallow depth of field, usually work best:
actually the example you provided is tight, no distractions, all attention on the subject and soft, if any, background.