Nikon Nikkor 600mm f/4 ??

Considering buying this lens for my D500. I currently have the 200-500mm f/5/6. It's not so much an additional 100mm as it is a faster lens. I go out early in the morning so am thinking this lens will do better for those moments before sunup or after sundown. Any experiences with the 600mm?
Thanks!

I do not have that specific lens, but with the larger aperture and being a prime vs a zoom it should be faster and handle low light better.

That's my way of thinking. Thanks!