Interesting,... I too started my slow migration to Nikon with the D810 around the same time. Only I went from the 6D and 70D. Like you, I had a few copies of L glass facing unemployment in the bag too. Kept the glass and upgraded the 70D to the 7DMk ii,... sports is a big part of my shooting. Got a very good deal on the D810/24-70 f/2.8 kit, then landed on the 70-200 f/2.8 a couple weeks later. Waiting on B&H to fill their back-order on the 200-500 now.
I guess when the dust settles,... I'll have the 7D2 married up to the 24-105L, 70-200 f/2.8L II, 100-400L gen I, and the 135 f/2 prime. Don't know why I'm hanging onto to the 135 mil.
Challenge now is getting used to everything screwing on backwards. Amazed Nikon doesn't have a 600 EX-RT or 430 EX III-RT equivalent. But also like you,... I'm very pleased.