I just bought a sigma 24-70 2.8 lens. Love it. Maybe the more expensive brands are a little sharper, but I've no issues with mine. If I had unlimited resources, I'd probably buy a more expensive lens, but I think a lot of the quality issues that the 3rd party lenses of the past had are gone now. The early sigma tamrons were not as good as todays lenses.
Best,
James
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