Lightandmatter posted a video comparison of Canon EF 24-70mm f/2.8L II USM lens and Tamron SP 24-70mm f/2.8 DI VC USD lens.
Conclusions from Lightandmatter:
Landscape photographers (and others for whom sharpness is most important) do not typically shoot at f/2.8, and when stopped down, the differences in image quality are minor at the wide angle end.
Those photographers who are most likely to use the image stabilization on the Tamron (such as wedding, event, or travel photographers) are also, I think, the photographers who are less likely to need ultra-sharp borders. If a photographer is focusing on a nearby subject, the edges of the frame frequently contain background this is slightly out of focus anyway.
If you shoot hand-held rather than from a tripod, the advantage in sharpness gained from having VC (Image Stabilization) will outweigh the advantage of having what would otherwise be a sharper lens at most common shutterspeeds. Next time, I’ll have to remember to shoot hand held with both lenses in situations with moderate light.
If sharpness is critical to the work you do, you shoot from a tripod, and you need to shoot with a large aperture, there’s no question: the Canon 24-70 f/2.8L II is simply better.
|EF 24-70mm f/2.8L II USM||Amazon | B&H | Adorama | UK | DE | JP|
|Tamron SP 24-70mm f/2.8 DI VC USD||Amazon | B&H | Adorama | UK | DE | JP|