This is a nice comparison.
TOP: Sigma 150-600 at 850mm D810 f11 ISO1600
BOTTOM: Tamron 150-600 D7100 f8 ISO800
https://dl.dropboxusercontent.com/u...m/Sigma 150-600 at 850mm D810 f11 ISO1600.JPG
https://dl.dropboxusercontent.com/u/16187250/Sigma 150-600mm/Tamron 150-600 D7100 f8 ISO800.JPG
TOP: Sigma 150-600 at 850mm D810 f11 ISO1600
BOTTOM: Tamron 150-600 D7100 f8 ISO800
https://dl.dropboxusercontent.com/u...m/Sigma 150-600 at 850mm D810 f11 ISO1600.JPG
https://dl.dropboxusercontent.com/u/16187250/Sigma 150-600mm/Tamron 150-600 D7100 f8 ISO800.JPG