Andy,
Nice to see a fellow Canadian on stream and I really appreciate your comments.
You'll know that tax season is over in Canada and I was finally able to get to my store,
Henry's, and try the Sony and the "standard' Sigma for real.
I chose the standard Sigma for a couple of reasons.
The Sigma has macro capabilty and a hood - the Sony does not.
The Sigma was priced $70 lower than the Sony.
We talked about the APO version and my salesperson (a young, award winning photographer) said the price for the APO was $90 higher. She said the Tiffen Haze-1 filter (cost $30.) do the job.
We both took shots with my camera from 70 through 300mm with both lenses. There didn't seem to be any quality differential. The macro shots with the Sigma were a great bonus.
The Sigma actually seemed smoother and quieter than the Sony on my a200.
If I wasn't already sold

, the Canadian distributor for Sigma, Gentec International, offers a 5 year warranty on the lens.
I walked out with the Sigma in my bag looking forward to shooting a lot of great pictures with it!!!
Regards,
Taxeye in Canada