After releasing the new Sony 70-200 f/2.8 ii, Sony is at it again with the lighter, smaller, and faster Sony 24-70 2.8 GM ii. The most important question is how does it compare with the Sigma 24-70 2.8 DN and the Tamron 28-75 G2. The Sony 24-70mm 2.8 is definitely ahead of Sigma and Tamron
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