DxOMark published their test results for the Sony Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM II (SAL2470Z2) standart lens which is currently priced for $2,100 at Amazon.
Sony Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM II lens test results shows the lens score of 21 points and performed an excellent performance.
Tested on the 24-megapixel full-frame Sony A99 SLT camera, the lens has high sharpness levels in the centers from the initial aperture, and stopping down improves sharpness mainly in the outer field only.
Sony Zeiss Vario-Sonnar T* 24-70mm F2.8 ZA SSM II Gets DxOMarked : Excellent Performer Optically
Sony Zeiss Vario-Sonnar T* 24-70mm f2.8 ZA SSM II vs. Canon EF 24-70mm f2.8L II USM vs. Nikon AF-S Nikkor 24-70mm f2.8G
From DxOMark conclusion:
As with its sibling, the new lens coatings have had a somewhat mixed effect on the sharpness levels across the field. While it has improved uniformity at 70mm, there are several instances where sharpness levels have dropped. It’s particularly noticeable at 50mm in the mid and outer field position. Overall, though, the lens is good performer. The addition of AF compatibility with the contrast detection AF capabilities of the E-mount cameras (using an optional adapter) and the weather sealing are significant benefits over its predecessor.