Gday folks

I am looking to extend my artillery as I currently only have kit lenses & Canons 50mm f1.8 and have almost decided on the Sigma 24-70mm f/2.8 EX DG Macro. I want something that will improve my portraits (candid party shots mostly) with the f2.8 and zoom, but also like the versatility that I can use it for other things, especially Macro.

I am told that it is not as good as a dedicated Macro lens but am sure it will be better than what I have currently.

Before I pull out the credit card I would like to hear your opinions and experiences on the performance of this lens for my needs.

Thanks!

Simon