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If you are comsidering to shot lot of interirors and architecture, I would suggest Canon lenses (if you intend to do this professionally). I am doing lot of that type of commecial work, over 30 shooting days oer year and I am using Sony A7 systm with Canon TS-E 17/4 L, Canon EF 14/2.8 L II and Sigma 15/2.8 fisheye. (Using Metabones Smart Adapter).
Canon TS-E 17/4 is most used lens for those projcts (over 80% of shots). It’s rather unique lens on the market and it has great features and very solid IQ. Shift control allow not only for perspective view point correction, but also for panorama stiching without necessity to solve parallax problems. Using lens for panorama will give a horizontal angle of view of approx. 12mm lens.
Canon EF 14/2.8 L II is the UWA lens with best distortion corrction that I know about.
Sigma 15/2.8 fisheye is very good value for money and fisheye sometmes gets handy.
I am using Sony A7 system because of the very good EVF and LCD live view, which is far more comfortable for this type of shots than optical view finder. Possibility to tilt LCD is also very convinient.
Nikon D810 is great camera, but more orientd toward Wildlife or sport or othr situations where super tele lenses or fast AF is needed (as well as weather sealing). To use most of it, you’ll need top quality (top price) lenses.
All the best,