Right, I was set on buying the Tamron 17-50 after reading just about everything out there. However stock issues, Barclaycard fraud protection and other issues have delayed the purchase and I don't know if it's a sign?! I don't mind springing the extra for the Canon if it's significantly better in the AF area. This lens will be used a lot trying to capture my 1 year old so fast focus in low light will be essential. It would delay the purchase of a macro lens but I can live with that 
Has anyone here got the Canon? The wider end I will be using for landscapes to see if I like it enough to buy an UWA in the future. Although I kinda hope this will be a good general purpose everyday lens. I have the 50mm f1.8 and a Sigma 70-200 f2.8. In addition to this zoom lens I will be looking to add a macro lens or maybe extension tubes and a 1.4 50mm... I also like the sound of the 85mm 1.8 as that is reported to have fast AF?
edit: I also meant to ask about the Canon 15-85, this seems to be getting a lot of love from some quarters...
another edit: or... Do I go for a 24-70 (or possibly 24-105) and then get an UWA?...
Images like this are making me consider the 17-55 despite the price tag: http://www.msbphoto.com/orangebeach/h35f6e8be#h35f6e8be

Has anyone here got the Canon? The wider end I will be using for landscapes to see if I like it enough to buy an UWA in the future. Although I kinda hope this will be a good general purpose everyday lens. I have the 50mm f1.8 and a Sigma 70-200 f2.8. In addition to this zoom lens I will be looking to add a macro lens or maybe extension tubes and a 1.4 50mm... I also like the sound of the 85mm 1.8 as that is reported to have fast AF?
edit: I also meant to ask about the Canon 15-85, this seems to be getting a lot of love from some quarters...
another edit: or... Do I go for a 24-70 (or possibly 24-105) and then get an UWA?...
Images like this are making me consider the 17-55 despite the price tag: http://www.msbphoto.com/orangebeach/h35f6e8be#h35f6e8be
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