LensRental posted a detailed comparison of the best ultra-wide zoom lenses from Nikon, Sigma, Canon and Sony:
Their conclusion:
“If you need quality, wide range and you’re fine using a tripod; the Canon is the way to go. Need a lightweight lens with pretty good focal range and sharpness? Sony is the lens you want. Nikon is the best overall, in my opinion, seeing as it has the f/2.8 aperture and the sharpness you want even if it doesn’t have the range of the Canon. If you are looking at your budget and can’t get one of these others, the rugged, sharp and all around keeper is the Sigma. The reality is that there is not a single bad lens here. I’ve mentioned my dissatisfaction with Sony’s lens offerings a few times in the past but really, this is a winner that surprised me for how fun it was, and it may be my favorite of the group. The Nikon gets my vote for sharpest in its focal range. The Sigma feels rugged and is pretty well rounded, better than average.”
