I just came back from my holiday where I was shooting exclusively with this lens. I actually bought it for this holiday. Now, after converting from RAW and analysing several K of photos, I can confirm that 17mm is a bit more problematic than it was with original 17-70. However, I can clearly see field curvature effects here. Many shots are softer in the corners near infinity, but quite sharp in those corners with objects in the mid range. Soon, I found out that it gives better corner sharpness when I’d choose focus at infinity and stop down to f5.6 – f8 (I was accustomed to focus on closer objects at this focal length). Will try USB dock to compensate for this. Shooting close-up and mid-range objects, sharpness is more than adequate @17mm. The rest of the range is more straight forward to get consistently good results. Overall – great lens, super versatile, much better that the original 17-70 in every regard (even 17mm is better overall, IMO)
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.