Sigma 24-70mm f/2.8 for Sony E-Mount Review vs Tamron & G Master - YouTube
Sony FE Standard Zoom Shootout - Sony 2.8/24-70 GM vs. Sony 4/24-105 G OSS vs. Tamron 2.8/28-75 Di III RXD - Part 1: Sharpness testing - phillipreeve.net
Amazon.com : Tamron SP 24-70MM Di VC USD Lens for Sony DSLR Cameras AFA007S700 (Model A007S) : Camera Lenses : Electronics
Sony 24-70 f2.8 GM vs Tamron 28-75 f2.8 Lens Comparison