28-70 2.8 for 4 years on a Nikon mount, and find the results very nice.
Interesting you ask this question. I shot the other day using studio flash, using my friends new Nikon 28-70 ED lens, that sells for $1,400.00 . I then put my Sigma lens on and shot several frames with that. I have to tell you, his lens was sharper, but not that much. It is easier to focus with manually, and in the autofocus mode, it is very, very smooth. No noise at all.
Anyway, like anything, there's a cost benefit analysis that must be made when making a large investment. For me,I shoot mostly with my 80-200 ED 2.8, so the other lens gets very little time.
I hope this helps.
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