I know there is a lot of internet grumbling about this lens. I have had it a while and used it extensively on a trip to India earlier this year paired with the a7r. I really like the lens. I can zoom in and see details of the Taj Mahal on the top image. I think this lens is quite sharp and so versatile.
On the bottom image I had to use lens corrections in Lightroom or the painted line on top of the frame had severe mustache curvature.
I am traveling to Provence, France in a few weeks, I plan to bring the 24-70 Zeiss FE and the a7r. I am also planning on bringing along a FF Nikon because we will be going a fair amount of tripod shooting and for that I will use the D800 with 16-35 and 90 MM Tamron macro.