What's the difference between these 2 lenses from a filmmakers point of view? Besides $500. Is the cheaper lens better than the Tokina 28-75 2.8 which is at the very bottom?
Sigma 28-70mm f/2.8 EX DG IF Aspherical Lens for Canon SLR Cameras
http://www.amazon.com/Sigma-28-70mm...=UTF8&qid=1319736851&sr=8-5#productPromotions
Sigma 24-70mm f/2.8 IF EX DG HSM AF Standard Zoom Lens for Canon Digital SLR Cameras
http://www.amazon.com/Sigma-28-70mm...KO5W/ref=sr_1_5?ie=UTF8&qid=1319736851&sr=8-5
Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) (but instead for the canon)
http://www.amazon.com/Tamron-28-75m...5P8W/ref=sr_1_1?ie=UTF8&qid=1319737172&sr=8-1
Sigma 28-70mm f/2.8 EX DG IF Aspherical Lens for Canon SLR Cameras
http://www.amazon.com/Sigma-28-70mm...=UTF8&qid=1319736851&sr=8-5#productPromotions
Sigma 24-70mm f/2.8 IF EX DG HSM AF Standard Zoom Lens for Canon Digital SLR Cameras
http://www.amazon.com/Sigma-28-70mm...KO5W/ref=sr_1_5?ie=UTF8&qid=1319736851&sr=8-5
Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) (but instead for the canon)
http://www.amazon.com/Tamron-28-75m...5P8W/ref=sr_1_1?ie=UTF8&qid=1319737172&sr=8-1
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