You have a decent set of lenses, but you would clearly benefit from upgrading your body. The 5DII was a great camera when it came out, but it is a bit seasoned now. The 6D is doing most things (that matters) better than the 5DII, so it is a better choice IMO. And, regardless of what some crop fans may say, full frame is a big improvement over crop.
5DIII, 1DX, 8-15/4L, 16-35 f4L IS, 24-70/2.8L II, 70-200/2.8L IS II, 70-300/4-5.6L IS, 200-400/4L IS 1.4x, Zeiss 15/2.8, 17/4L TS-E, Zeiss 21/2.8, 24/3.5L TS-E II, Sigma 35/1.4 Art, Zeiss Otus 55/1.4, 85/1.2L II, 100/2.8L IS Macro, Zeiss 135/2, 600/4L IS II