After exploring this I came to the conclusion that the Sony 16-35 was the shortest road thereYou are only looking for alternatives in A-mount? Or zooms in general? Because the Sony 16-35s in e-mount are pretty well regarded, and I know the Canon 16-35L is commonly adapted.
The Sony 16-35 f4 has a smaller footprint than either 16-35 f4 lenses for Nikon and Canon. Also the Nikon version has ugly mustache distortion at 16mm.Yeah, I don't need f2.8 and prefer small lenses as I shoot on foot, sometimes while hiking or skiing. Not that the Sony 16-35 is a featherweight but that's OK.