Sigma APO 150-500mm f/5-6.3 DG OS HSM review by Stockholmviews.com, page 4
The red square indicates where I have focused the both lenses during the following test shots image above represents a full frame at 500mm.
Distance Camera-Focuspoint was about 800m Camera on Tripod OS off.
http://maps.google
All of the following frames are shot at F8 but at different focal lengths as indicated.
Sigma 80-400mm OS
Sigma 80-400mm OS F8 @200mm
Sigma 80-400mm OS F8 @300mm
Sigma 80-400mm OS F8 @400mm
Sigma 150-500mm OS
Sigma 150-500mm OS F8 @200mm
Sigma 150-500mm OS F8 @300mm
Sigma 150-500mm OS F8 @400mm
Sigma 150-500mm OS F8 @500mm
Stockholm city hall tower shot at F8 from about 1000 meters @ different focal
lengths 200mm, 300mm, 400mm and 500mm with APO 150-500mm f/5-6.3 DG OS
Image above represents a full frame at 500mm
Sigma 80-400mm OS F8 @200mm
Sigma 80-400mm OS F8 @300mm
Sigma 80-400mm OS F8 @400mm
Sigma 150-500mm OS F8 @200mm
Sigma 150-500mm OS F8 @300mm
Sigma 150-500mm OS F8 @400mm
Sigma 150-500mm OS F8 @500mm
To me it looks like the old 80-400 have a slight advantage regarding sharpness
maybe that EX label helps a bit :0)