To answer...... Something newer, better, or should I just stay... Are these cameras I mentioned better..... Or not really......
I can't talk about the other 2, but I just upgraded d7100 to d500.
Is it better? As I'm keen on wildlife yes it's significantly better, faster focussing, better ISO, better viewfinder, nicer feeling body, two back buttons for single and group af, new toys such as touch screen for flicking through pics and wifi for geotagging my pics via my iPhone, and again the focussing is great. Not to mention 10fps.
I wouldn't say the picture quality is miles better, but all the above (even though I only had it a week) are showing signs my keeper rate is gonna be so much higher.
Having said that, the info the cam takes and how recoverable shadows and highlights are, is night and day compared to the d7100.
Your lenses seem to point more towards landscape/portrait not sports and wildlife so perhaps d810 would be more relevant?
I don't think picture quality is worth the upgrade enough to say better, but the above features make the upgrade better for me.