Steve Perry already has his video up:
https://backcountrygallery.com/nikon-180-400mm-first-test-and-sharpness-comparisonAppears to be balanced and unbiased ... but a little quickly-done.
He briefly touches on the contrast, but I thought the 180-400 f/4 blew all the other lenses away in micro-contrast and 'pop' to its rendering of the colors on the map test.
Only the 600mm compared, barely, though the 600 f/4 was much sharper in the corners.
(The 180-400 was sharper than all the others zooms in the corners, by a wide margin, but was not as sharp as the 300 f/4 PF in the corners.)
Interestingly, the 300 f/4 PF was slightly superior, sharpness-wise, @ 300 (naturally), but the 300 FP was
also equivalent sharpness-wise @ ~420 with a TC, compared to the 180-400 @ 400.
To me, what this test really showed was the value of the 300 f/4 PF ... especially for the price and with the manageable weight factored-in.
Still, the color-rendering and micro-contrast of the 180-400 was considerably better.
Edit: My takeaway, aside from splitting hairs on sharpness, if you click on each of the provided images, and zoom-in full-size, was how superb the 180-400 was in its micro-contrast & colors, as well as an utter lack of CA on the letters.
