Probably most of you here swear by Canon's 70-200L IS II, and for excellent reasons. From numerous forum posts here I can understand this is one of the best zooms produced, period. But I am not looking for any more info about Canon's offering. What I am looking for is personal experience of those of you who might be using the Sigma 70-200 OS. It would be great if any of you actually used both the Canon and the Sigma. Would you please care to share your opinions and experiences? I am not a professional photographer, so justifying buying the Canon is almost impossible for me. The similar offering from Tamron does not yet have OS/VC/IS. So it would be a great help to learn from your opinions and experiences about the Sigma lens. Thank you all in advance.