Read our detailed comparison of the Sony 70-200mm F2.8 G SSM II vs Sigma 70-200mm F2.8 EX DG OS HSM lenses to find out their strengths and weaknesses, and decide which one to choose.
Sony FE 70-200mm f/2.8 GM OSS Lens for Sony E SEL70200GM - Adorama
Sony FE 70-200mm F2.8 GM OSS II (SEL70200GM2) Review
Sony FE 70-200mm F2.8 GM OSS II Lens SEL70200GM2 Genuine Sealed - Tracking 27242923768
Sony FE 70-200mm F2.8 GM OSS II vs Sigma 70-200mm F2.8 EX DG OS HSM Detailed Lens Comparison
Review: Sony 70-200mm f2.8 G SSM II (Sony A Mount)
Sony 70-200mm f/2.8 G SSM II Lens
Sigma 70-200mm F/2.8 APO EX DG [HSM]
Sony Alpha Blog : Sigma 70-200mm F2.8 DG DN
Sigma 70-200mm f/2.8 APO EX DG Macro HSM II lens for Sony A-Mount [77] at KEH Camera