Relax! As you said, you have the range covered at 2.8 with your MkII brothers 
Why do you need a bigger aperture and how much bigger?
At 200 you can get the 2.8 it saves some weight. I wouldn't buy it. There is a 200 f2.0 but let's keep it serious...
At 135 you get 1 stop (big deal...) and a better bokeh. Unless you shoot full body portraits all the time and I don't, I wouldn't buy it
At 85 the f1.2 is an overkill. Portraits with sharp eylashes and blurry nosetips don't appeal to me. The f1.8 is ok, has some problems, but at 1 1/3 stop less than the f2.8, I am not gonna spend the (little) money it costs. A close call though...
At 50 a f1.2 read the comments about the 85 f1.2. A well priced f1.4 (a Sigma Art?) gets you two stops, bokeh maybe less weight... O yeah! It's on my list.
At 35 a f1.4 read the comments about the 50 f1.4. O yeah! But if you have the f2.0... it is a tough sell.
At 24 an f1.4... Other than astro on a FF I don't know what I would do with such beast. Shallow DOF on a 24?
The honest proposition is the EF 16-35 f4. It is on the top of my list!
The EF 11-24 is in my bucket list... 
Bottom line (for me, anyway) the two MkII brothers are the best remedy for GAS. I find very difficult to justify buying anything in their range, especially since I have not bought the two top lenses in my list, the EF 16-35 f4 and the Ef 100-400 MkII. That will be a while...
In the meantime, I am renting the 100-400 for my son's MSc graduation, I hope that I might justify it for permanent duty, so I can write a grant proposal to my wife...