Take a look at the photos posted at http://www.fredmiranda.com/forum/topic/1255248?b=2 . Many of the photos are impressive. If you have good full frame Nikon glass, losing AF is a big sacrifice. Maybe if you make the switch, go all the way, buy a A7rii and get that high resolution sensor and sell your Nikon glass and get Zeiss glass. While the Zeiss glass is expensive, look at the photos in the website I referenced and make your own decision.
Good luck with whatever you decide..