I've wanted a "propper" macro lens for my dslr for some years now, so I figured it was about time to get one. After looking at reviews and prices, I initially decided on the sigma 105mm, but went a bit overboard when ordering and got the sigma 150mm f2.8 macro instead.
One thing I want to make perfectly clear is that sigma is a bunch of inbred cousin' lovin' retards, because the lens is NOT a constant f2.8. The propper name for it would be f2.8-5.6. God damn man-juice chugging dillholes
YES, I could have read up more on the lens before getting it. But on the other hand: Sigma could be a bit more honest about their product, and call it what it bloody is, instead of just "f2.8" - which it is not (same goes for their 105mm f2.8)
Anyway... On to a quick test (I just got the lens today). I pulled out a watch I bought 14 years ago, which is pretty small, to test the lens on. Here's the watch next to my nokia 6300 to give you an idea of how small it is:
No, not the most masculine thing in the world, but it was kinda pimp when I was 19 (and mostly drunk

). Aaaanyway - Here's how it turned out:
100% crop:
Looking forward to playing more with it. I would have loved it totally if it was f2.8 like the name implies, but it's not. So it's not SUPER AWESOME, but its still pretty sweet

The small DOF on this lens is amazing.