Question: Do you think switching to pro-grade Nikon gear will restore
your confidence in the brand?
I honestly don't know how to answer that. My 70-200 F/2.8 VR has
already been rebuilt once and has never focused right at distance
(Nikon agrees with that, it's not a case of unrealistic
expectations). I have recently been looking at both Nikon and
3rd-party pro lenses to cover the 18-70 range. To be honest, the best
lens I've had so far was the Sigma 100-300 f/4. I sold it when I
moved to the 70-200 for the extra f/stop in brightness, but that lens
was built like a tank and never gave me a moment's problem.
So, at the moment, my answer is, unfortunately, "I don't know".