Do yourself a favour - buy this lens - its around $800 and worth every penny. By far my favourite lens in terms of image quality, incredible bokeh and just a lush quality to its images. I use it mostly for portrait / people stuff. It feels very solid and well built and autofocus is quick. I have a few Sigma lenses - they vary in quality - but this will beat Canon/Nikon varieties which are double the price. I have attached an example of a shot i took a while back.