The last thing on my list is a long prime but the jury is still deliberating which. I got sidetracked by getting the D810 first.
For the rest I would not know what else I'd need. I got my lens set complete and although there's always more or better, what I have is good, or good enough, for what I require.
Maybe the next generation FX could get on my list again. I checked some technical data about the D7200 which behaves perfect for my ISOless shooting style (if that data is correct) so if they continue that trend towards the next FX, one of mine will be replaced.
But until then, there's just a long prime on my list.