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The 100-400 is a great lens Iain. I used mine exclusively until the 200-600 came along from which point it started to collect dust. The minimum focusing distance is much smaller than the 200-600 which makes it a great bug and butterfly lens. I never felt mine was soft. However, since picking up the Sigma 500 my 200-600 is now collecting dust. I don't feel like there's anything between them in terms of sharpness but I appreciate the lighter weight.