I have always felt this lens is a bit under-rated. Its attributes — constant aperture, OSS, and useful range — belie its relatively low ratings (Dyxum 4.53 overall; 4.43 sharpness). I got some pretty good results with this lens on my A7R cameras.
Here is a description from Brian Smith’s Ultimate Guide:
Compact wide-angle to short telephoto zoom with constant f/4 aperture lens that remains fixed in length while zooming. Features one extra-low dispersion element and five aspherical elements to combat aberrations as well as a Zeiss T* anti-reflective coating to keep flare and ghosting to a minimum.
Professional reviews:
Sample images: