As if it were necessary, with great open mindness, ample generosity and sincere hopes, BJ Nicholls made the exercise to compare the Sigma to the Nikon VR. He bought the VR. I bought it too. You can see a few of the results here. If you want to see how it performs on a digital SLR, search, for example, for Cassie LaiBrook's bird images with her recent acquisition: a D100.