Although the constant large aperture is not 2.8, this "small ternary" lens also uses Zeiss T* coating. As can be seen from the name, it adopts the Vario-Tessar structure (zoom sky plug structure), which is different from the Vario-Sonnar structure (zoom loose structure) of Sony's single A-mount "big ternary" lens. Generally speaking, the lens design, dispersion and sharpness of Song Na structure with large aperture are not as good as Tiansai.
Therefore, the performance of this Vario-Tessar T* FE 24-70mm F4 ZA OSS lens is not inferior to that of vario-sonnar t * 24-70mm F2.8 zassm (first generation A-mount big ternary).
If you want to say shortcomings:
70 mm terminal imaging generally
There are seven aperture blades, and Jiao Wai is a little worse.