Yes! If you refer to the Nikon 5oo/8, I'd rate the 1ooo/11 as academically sharper outright. If you want to compare equal magnification, i.e. a 5oo + tele converter vs. the 1ooo/11, the latter clearly wins.
I wonder if we can kick-start this thread (again).
I'm interested in a long mirror lens with respectable IQ.
I recently started a thread on the Jintu 900/8 mirror, lots of interesting discussion. but nothing specific on the Nikon 1000mm f11.
I am encouraged by your comments on the sharpness of the 1000/11 wrt the Nikon 500/8, which seems generally highly regarded as well.
Would say that the Reflex-Nikkor 1000mm f/11 is similarly sharp and contrasty as the Nikkor 800mm 5.6 ED IF AI-S @ 5.6 or the Nikkor 500mm 4.0D II ED IF AF-S @ 4.0. Honestly was quite surprised by the results.
Would recommend keeping the ISO reasonably low, high shutter speed, a tripod, and to focus carefully, the focus handle is essential to control vibration.
The 1000mm f/11 works with a TC-301, after removing the rear filter, f/22 is very limiting and I’m not sure if it adds detail.
I didn’t test previous Reflex 1000mm Nikkor’s, like the one with built-in filters or the 500mm variants.