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DXOMark has completed their review of the EF 24-105 f/3.5-5.6 IS STM lens.
Despite ranking behind the more expensive Sigma and Canon pro L competition, the new 24-105mm STM standard zoom offers respectable results across the board. But if you can afford to shell out an extra $300 for the $899 Sigma 24-105mm f/4, you’ll certainly benefit from better edge sharpness at the wider aperture settings, a faster fixed f/4 aperture when shooting at 105mm, and better light transmission, too.