Awesome lens for the price
Funny how different people get different results. For me it was the worst lens I had ever used and I sold it within a week of buying it.
It was fine at the tele end but on the wide end it was very poor. The sides were not sharp at any aperture. This was very much as was reported in several reviews of this lens and next time I will take more notice of these reviews.
Was a pity as the specs of the lens were great and it has great VR.
According to those reviews the new C version is better at f2.8 and f4 especially, but all through the aperture range at 17mm it is sharper than the older version. According to the reviews, it is MUCH sharper at the long end. Check it out: