If you were able to load the "o" (original resoulution) it should be possible to see the difference I hope. I think my copy of the 24L II is bad, so I will investigate futher.
The problem with 16-35 is distortion espessially below 24m'ish.
I did not put in any distortion compensation in Lightroom, and yes if you swap between to pictures you see changes.
Never the less, the 24-70 maybe the new work horse, only thing is the impact of missing image stabilization.
1DXmk2: 24L, 16-35L II, 24-70L II, 24-105L, 100L f2.8, 70-200L 2.8 II IS, 400 2.8 II IS, 85L f1.2, 2x600RT,- Sony: A7s2, A7R2, Batis 25, FE 35 f2.8, FE 16-35 f4, FE 24-70 f4, 24-70 f2.8GM, FD 28-135 cinelense, Metabones EF to Sony E adapter