My daughter is getting a Canon 5D. She would like to know if the Canon 2.8 70-200 IS II is that much better than the Sigma 2.8 70-200 OS lens.

She had seen reports of poor focus on one side of the lens, blur at various focal lengths, and the focus ring breaking on the Sigma?

Have any of you seen these issues?

Thanks,

Ross
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In SI, a little termination and attention to layout goes a long way. In EMC, without SI, you'll spend 80% of the effort on the last 3dB.