[stoppingdown]

• is the lens sharp enough to burn this amount of money ? After all, it's only f/4 and at least 40% more expensive than the current version.
  

 

For the IQ, we need to see some real world sample photos. According to the computer-generated graphs, it's not worse, possibly better, than the old one. The 40% goes for weight and stabilisation. If I still bought Nikon stuff, I'd grab it immediately after checking from the first samples that there are no surprises: it would mean not only to save 700gr, but also that I could get rid of the tripod in many cases. Today weigh for me makes the difference between shot or no-shot, or shot-but-what-a-pain-in-the-neck-in-the-evening...