Sigma 24-70 f/2.8 ART vs Tamron 28-75 for Sony - Light And Matter
Sigma 24-70mm f/2.8 for Sony E-Mount Review vs Tamron & G Master - YouTube
Tamron 24-70mm f/2.8 Di VC USD G2 Lens Review
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
Sony A7r II - AF Test w/ Tamron 24-70mm f2.8 VC [March 2016] - YouTube