Here is more information, including MTFs for Wide / Tele. The SR element is distinctly slim - appended images
https://www.nikon-image.com/products/nikkor/fmount/af-s_nikkor_120-300mm_f28e_fl_ed_sr_vr/spec.htmlhttps://petapixel.com/2020/01/06/nikon-af-s-120-300mm-f-2-8e-fl-ed-sr-vr-a-versatile-9500-pro-lens/contrary to orthodoxy, this lens should outperform the venerable 300 f2.8G primes for many wildlife subjects. Teleconverters work really will the "latest" 300 f2.8G, for which Nikon optimized the TC2 III. We can expect the new 120-300 f2.8E to match if not better this performance. See Brad Hill's take wrt shooting large mammals at f2.8 with the ability to zoom out to frame his Animalscapes:
11 Feb 2020: More Thoughts on the AF-S NIKKOR 120-300mm f/2.8E http://www.naturalart.ca/voice/blog.html#500mm_wars_1We read the claim "Numerous considerations for ease of use, condensed into a lightweight mobile body...." Well, this zoom weighs 3.25kg (slightly less than the older tank of the Sigma). It's a pity Nikon did not consider a honeycombed chassis used by Canon and Sony in their lighter telephoto primes. No less serious, is where this Nikkor exotic departs from tradition. It lacks the rear-filter apparatus to use a CPL easily; this exotic takes 112mm filters out of reach deep under the hood?!
according to Nikon [added in edit]:
"The optical system uses one newly developed SR lens in addition to one ED lens and two fluorite lenses. Chromatic aberration has been greatly reduced, and high expression power equivalent to a single focus 300mm lens has been achieved in both resolution and blur throughout the zoom range."
SR lens [NEW]"A lens that uses Nikon's proprietary special high-dispersion glass, which has the property of refracting light with wavelengths shorter than blue. By controlling light with short wavelengths that are difficult to correct, light of each wavelength can be condensed to a higher degree, enabling highly accurate chromatic aberration correction. In addition, since it can be used in the same way as ordinary optical glass, the degree of freedom in lens configuration is improved, and it contributes to downsizing and weight reduction of the lens while realizing high optical performance."
"Despite being a zoom lens that covers a wide focal length range of 120-300mm, it realizes high image quality that can be satisfied by professionals. Especially at infinity with a focal length of 300mm f / 2.8, it offers higher resolution than a single-focus 300mm lens *. In addition, shooting that makes use of the beautiful bokeh of a single focus lens, such as a sports portrait, is also possible."
*Comparison with AF-S NIKKOR 300mm f / 2.8G ED VR II.2