The 300mm PF-E is over priced for what it is. No doubt, the 600mm 5.6 PF-E will be likewise unless in both cases, you place a very high additional value on weight/size. This is where the premium is struck by Nikon for these products. It may well be a premium you are happy to pay for these conveniences.
Hmm, I fear you have it exactly backwards: the 300 f/4 PF is
a steal compared to other options.
I have personally lugged the 'premium' ($5,500) 300 f/2.8G VR II for over 2 years ... and I sold it to get the ($2,000) 300mm f/4E PF. Two things are true, now that I've made the switch and spent the money:
- The 300 PF the best $2,000 I have ever spent in my 10 years buying lenses;
- I would never buy the 300G version again.
The 300 PF is by far the more preferable lens to bring in the field, really in almost conceivable field circumstance than the 2.8G version. It's lighter, easier to deploy, and
gets you more shots, with the image quality more than matching the premium version in all but the rarest circumstances. You can go from quasi-macro, to telephoto, all hand-held, and you can hang onto it all day long without
once ever feeling the weight.
Virtually every user who has the "premium" 300 f/2.8G is looking to dump it for the 300 f/4E PF ... and everyone who has actually made the switch (almost universally) remarks, "
the 300E PF is the most enjoyable lens they've ever used."
Mark my words: when the 600 PF comes out there will be 1) an exodus of people with their $12,000 600mm f/4 "barbells" wanting to dump these cumbersome tools for the much more comfortable 600 f/5.6 the moment it's available; and 2) the image quality of the 600 PF will be just as exemplary as the FL ED glass. Maybe not on test charts performed by pixel-peepers, but in real life by those who take photos.
Honestly, some of the best birding shots I have ever seen have come from 300 f/4 PF users ... with the 'only' complaint being inadequate reach in some cases. The 600 PF will address this deficit.
If Nikon makes a 600mm f/5.6 lens that has the same/better image quality as the 300 f/4 PF ... at half the weight, and less than half the price ($5,500 as opposed to $12,000) ... even Ray Charles could see it is more than worth a 5-6K tag.
Other considerations include, say, the Sigma 500mm f4. While it will likely be heavier at 3.4kgs (and 53cm with long hood attached), it is a reasonably high standard lens. In Australia it is currently priced at approx USD$4900.
Many may not consider possibilities that are not Nikon. However, there are a handful of third party lenses that have outstanding specs, performance and pricing. Mongo would happily go for the anticipated 600mm PF-E in preference to other options provided it ticks all the right boxes. However, based on past experiences, he is doubtful that it will
Well, we all have our preferences of course.
Me? You couldn't pay me to lug around a $5,000, 7.5lb, 500mm "Sigma" ... when I could enjoy a $5,500,
3-4 lb,
600mm Nikkor PF.
The only problem I can foresee will be, just as the outrageous demand for the D850 has made it perpetually "on backorder" ... I believe the moment the 600 f/5.6E PF is released, it will be on backorder forever.