Did you try any shots with a significant light source in the frame? I tried a Sigma lens and a Tamron lens a while back, but found the flare problems to be really unacceptable compared to Nikon lenses so I gave up on the off-brand lenses. If this lens doesn't have that problem, then it sounds great.
Rick's caveat is telling. It's often tempting to try these off-brand jobs that seemingly offer lots of spec for less cash, but you really don't get something for nothing - especially with sophisticated optics - and each of my occasional forays into off-brand territory has proved an expensive disappointment. Stay with Nikon.
Regards, Tony H
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