mind giving a review? I was thinking of getting that lens for my d90. How are you finding not having image stabilization?
Just played around a little bit so far, not too much. The trail I went on yesterday didn't have many opportunities and today is thunderstorms and leaving on a jetplane later.
I'm not a sports or action photographer so I don't miss IS. It would only add a couple stops anyways, I can't justify the huge price gap for that right now, maybe later. If I had the cash, I wouldn't hesitate to buy the 70-200 f/2.8 L IS II. At 200mm on a crop body it is hard to keep it steady.
So far:
Lens is very solid, well built. Smooth action on zoom and manual focus rings. Well built tripod collar. The included lens hood is excellent, snaps on well and cuts down on stray light very well.
The autofocus is great, I really like the Sigma HSM in this model. It is very quiet, accurate, doesn't creep unless the subject has low contrast.
The f/2.8 is amazing. Not only does it allow you to shoot in lower light than the typical f/4 tele zooms, in good light it also expands your creative dof, both factors which ruled out the f/4 for me. This is my first tele zoom of my own. I played with the Canon 75-300mm zoom in the past, that thing was garbage compared to this (at 4x the price it should be, but still). I'm really pleased with the image quality.
I never played with the Canon 70-200 f/4L which I was considering besides this one, but on the retail websites I compared specs and this is what swayed me:
f/2.8 vs f/4, pretty huge deciding factor here.
Sigma includes a padded softcase for the lens.
Sigma includes a good tripod collar.
I have the Canon 20mm f/2.8 USM and 28-135mm f/3.5 IS USM. Comparing the USM in these to the HSM in the Sigma, I can't see much difference. HSM is great. I wouldn't hesitate to buy another lens with HSM in it.
I honestly don't have many good pictures for you to review right now, it has been insanely hazy in DC recently so any distant tele pics look like crap regardless of the lens. I can post some boring shots I took under a canopy of deciduous trees on a trail if you want.