Theres lot's of models, non-dg's are the first (mk1 dgs are "the best", but take that with a pinch of salt). Theres a mk1 and mk2 of them. Then the dgs, I think there are non-macro dgs. They are the same as the dg.
Then the "macros" focus much closer. There is a mkII macro and mkI macro. They are newer and "some say not as good" (again internet twaddle?). Then theres the new OS which is supposed to be pretty nice too.
Anyway, I've had a Mk2 non-macro, then I went to the canon IS MkI, it was worse sharpness wise but a little faster af and weather sealed. Then back to Mk1 Siggy. Mk1 I have now is probably be the best maybe? it's too close, for me the canon was better under 135 than the siggy, but the sigma was stronger over 200. Mine get's most use at 120-160mm so it's all pretty even. I would still have the canon if it wasn't for funding issues and IMO having the sigma rather than canon hasn't caused me any loss photos so. Yeah.
Sorry, very fragmented. Bad day today. Hope it helps though,
p0ss3s3d
