If I didn't have to pay for it, I'd take three 1200s and retire a lot sooner! ;D
I used to carry the 16-35 II/50L/70-200L II combo. The 16-35 II was the least favorite/used out of the three, but it's range is versatile. The three lenses covered a wide range of photographic situations, but after trying the 24-70 II, that trio will have to be broken up to include the 24-70 II. The 70-200 II stays, so the question is what is the third lens -- fast prime or ultrawide (i.e. TS-E 17). I tend to use fast primes more, so now I would pick the 24-70 II, 85 II and 70-200 II.
If Canon made a 50L II that rivaled the 24-70 II, then I'd opt for that over the 85 II. I tend to use the 50mm focal length a lot more...