I made a lot of changes and updates to my lineup this year. If I remember everything correctly, as of 1/1/17 I had the following: 1DX, 7D2, 16-35mm 2.8 II, Rokinon 24mm 1.4, 24-70mm 2.8 (v1), 35mm 1.4 (v1), 50mm 1.2, 70-200mm 2.8 IS II, 100mm 2.8 IS, 300mm 2.8 IS (v1), 600mm 4.0 IS II.
Moving forward to 1/1/18 it has become (new items in blue) 1DXII, Sony RX1R, 16-35mm 4.0 IS, Rokinon 24mm 1.4, 24-70mm 2.8 II, 35mm 1.4 (v1), Sigma 50mm 1.4 ART, 100mm 2.8 IS, 100-400mm IS II, 600mm 4.0 IS II.
The 1DXII is an obvious upgrade from the 1DX, the RX1R I had a couple years ago and missed it so I sold the 7D2 which I was never that impressed with to repurchase the Sony, no longer need 2.8 in the 16-35 range so that became the f4 IS, 24-70mm II was a long overdue upgrade, swapped the 50mm 1.2 for the ART because the Sigma is much better for astro, 300mm got sold because the 100-400mm is more versatile and easier to carry at the same time as the 600mm, then with the 100-400mm on board the 70-200mm wasn't getting used at all so it got sold as well.
Standouts from the new acquisitions are the 24-70mm II and the 50mm ART (and the 1DXII, but this is supposed to be about lenses). I miss the 300mm and will probably own it again at some point (or the Mark II), unless I opt for a 400mm DO II.