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.
1DXII, 5DIV, 5DSR, 8-15/4L, 11-24/4L, 16-35/2.8L III, 24-70/28L II, 70-200/2.8L IS II, 100-400/4.5-5.6L IS II, 200-400/4L IS 1.4x, 17/3.5L TS-E, 24/4L TS-E, 35/1.4L II, 100/2.8L IS Macro, 300/2.8L IS II, 600/4L IS II, Zeiss: 15/2.8, 35/1.4, 55/1.4 Otus, 85/1.4 Otus, Profoto B1