Lauchlan Toal Offline Upload & Sell: Off
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The Sigma 180mm f2.8, as far as I know, is a better lens than Canon's 180mm. Faster, stabilized, and more modern optics. Sigma's 150mm f2.8 is also a good compromise between size and focal length.
If you want a lens for strictly insects, I'd go for a 180mm. The extra working distance is useful for skittish critters, and you have more room to employ elaborate flash set-ups.
If you want to have a walk-around kind of lens as well, the 100mm is more useful, in many cases. Also, if you want to go beyond 1:1 macro, extension tubes will be more effective on a 100mm than a 180mm. However, a 180mm will be better for general wildlife, and quite good even for birds with a teleconverter. (Another advantage for the Sigma 180mm, you can use a 2x TC and still have a very usable aperture for wildlife.) The 180mm also makes a decent sports lens, if you're into that. But the 100mm is probably better for non-headshot portraits.
Anyways, those are just my thoughts. I would give serious consideration to Sigma's 150mm and 180mm, unless you need weather-sealing.
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