Was the box or packing damaged ? or just the lens.
400 F4.5 is ? 1245 gms the 300 pf with adapter is close to 900gms, is weight an issue ?
Optically there each different, even more so especially if you add a 1.4 TC to the 300 pf, the DSLR TC is no where as good as the Z Tcs.
the 300 PF has some focus breathing issues.
The 400 F4.5 with a Z Tc is better by far, the Z Tcs don’t degrade on Z glass so to speak.
I used the 300 F4 PF, a great lens, side by side to my 300 2.8 VR II, the 2.8 was clearly better especially when the TC 1.4 came into play.
The current 400 F4.5 is optically close to my 300 F2.8 VR II if you follow me.
Maybe put the foot on the break, (Q) are you looking to save weight or obtain optical benefits, in which case the 400 F4.5 is the better choice by far.
Can you live with a prime ??
So unless i have missed something for which i apologise.
Only an opinion
Thank you so much for the comments. The lens only was damaged and it's back on its way to Adorama.
I followed you perfectly and you have only missed one thing, perhaps, which is that I want to use the lens with my Z6III and only for travel. I currently use the Tamron 150-500 f 4.5-5.6 and am happy with it, but do not want to carry it on a plane with everything else.
Right now the 400mm f/4.5 is over budget.
I can wait until February, but will need something by then.
Other options are the tamron 50-400mm, though optically not as refined....
and about the same price as the 28-400mm z lens
.
The telephoto DX lens was also mentioned.
https://photographylife.com/reviews/nikon-z-dx-50-250mm-f4-5-6-3-vr
Or I try to find another copy of the 300mm PF f mount lens again but I doubt I can find the same deal (I used my Adorama points).
So there you are. Options exist, but bottom line is weight is primary....
Right now the 28-400mm for the money or the Tamron 50-400mm are my best options, I think.
The Z lens is only 1/2 pound less in weight and 1.5 stops slower. I'm leery of superzooms but it's gotten great reviews.
Things like distortion and vignetting do not bother me.
My only concern is f8 for the Nikon lens in low light, but in most cases when I travel, I'm not alone. I'm with my family and not there to do 100% wildlife shooting. They placate me by agreeing to hit a few spots but mostly, not.