Besides, Nikon has the better camera body, not the better system.
Depends on what you like shoot. Every Canon body weaker in most area to comparable Nikon body.
Their lens lineup is somewhat weaker than Canon's.
I believe you invent this general statement.
Their lens lineup is somewhat weaker than Canon's. They have good superteles, but the 200-400 is badly outdated.
You understate Nikon superiority, and overstate Canon/Sony.
Nikon 85, 105, 200, 300, 400, 500, 600, 800 primes all superior to Canon. Vast superior to Sony, except new 85 only exception for Sony, and by little bit.
Canon D5, D500, D810 all superior to Canon. Sony a7r2 does a little bit better than D810, only after iso 800. Still not so good all round.
As for zoom, Nikon 200-400 VR II is good as Canon, just no extendor. 1/2 the price. Sony nothing compare.
Old Nikon 14-24 still edge Canon. Canon has a few good zooms, most else behind. Most Sony lenses old Minolta, way behind. No sense argue further, have to agree.