AiS lenses are too obvious. Yes, the 17-55mm f/2.8 lenses are still being sold. There are ones where people have bought since as far back as year 2004 when it first came out ! Very obvious that they are out of warranty but the ones bought as late as 2 or 3 years ago would be the ones that would be questionable by Nikon as warranty card looks identical to the one now.
Yup. Those with older warranty cards sure cannot tipu. But I believe the warranty card as far as 2 or 3 years ago is the same as the one now if I'm not wrong. Those are the lenses that are in question and which Nikon wants to filter out.
Not to imply that vearn27's warranty claim is bogus but from another point of view, Nikon does this to protect themselves.
300mm would still look small. Unless you can crop crop crop...
Distortions are not too bad. Unavoidable on 35mm format. You just need to know how to avoid it.
If you need something wider and better performing that the 16-35mm f/4, the 14-24mm f/2.8 is the one. Cons? No VR and ND / CP filter system for it is very costly.
Anyway, if you have to choose only one, the 24-70mm f/2.8 is a good all rounder lens.
One lens to rule them all !!!
Seriously, it would depend on the type of photography you're into. Event photography, the zoom would be number one. Studio portraiture / product photography / landscape photography would benefit having primes. The 24-70mm f/2.8 would be slightly inferior compared to the primes in the same focal length (especially corners) but flexibility wise, no prime can beat it. If you're willing to sacrifice a little bit of quality for speed and flexibility, the 24-70mm f/2.8 is the one to choose.
While this sounds too funny and almost like a joke, it's very true indeed.
Nothing is ideal and perfect. Speed in exchange of sacrificing a little bit of quality is sometimes worth the gamble...
Ideally, the 14-24mm f/2.8 AND 24-70mm f/2.8.
Since you only can have one at the moment, get the 24-70mm f/2.8.
I would suggest keeping your DX as a 2nd body and mount a decent lens like the Sigma 10-20 to cover the extreme wide angles. The 24-70mm f/2.8 (or 70-200mm f/2.8 depending on the occasion) goes on the FX body.
Yup.
What's the problem with age? I still use lenses that are more than 10 years old.
Anyway, f/1.4 lenses sound very nice to have and shoot with but for events and concerts, your subjects need to be very still to be able to get a shot in focus under low light. DoF is so thin. With bodies delivering crazy high ISOs at fantastic quality, you should not be worried about shooting with f/2.8 lenses.
When their website was still new, I tried to register but somehow the application did not go through. Gave up after a few tries.

when you mention 10-20.. which sigma 10-20 you are referring to?