Sony 70-200 f2.8 GM II Review: I vs II vs Tamron 70-180mm

Chelsea & Tony Northrup review the NEW Sony 70-200mm f/2.8 GM II (about $2,800)! They compare it to the original Sony 70-200mm f/2.8 GM (about $2,600) and the Tamron 70-180mm f/2.8 (about $1,100 at KEH) for Sony E-mount.