Nice write up.
But the 70-200 doesn't do 280mm 2.8 w/ a 1.4x extendor which is where use mine alot. See I went 70-200 2.8 mk2 -> 300 2.8 IS V1 -> 120-300 2.8 OS -> 200 F2 IS w/ 1.4xIII
So far... it's fit my needs perfectly. The 56 1.2 is an amazing lens that I feel out performs the 85 Art. Better micro contrast and better colors (probably sensor at that point) but the 85 1.4 Art on FF still gives me a look that the cropper can't touch. The point for me of having a fuji and/or possibly sony is for travel... where I'm willing to make compromises...
I've had every 70-200 out there... I also shoot with the 400 2.8 IS V1 alot too. The 200 F2 simply is ahead of all three of those lenses in it's own unique way. But for me I use it 50/50 w/ the 1.4x extender... this was my "cheap" alternative 300 2.8 lens. So far it's working out great. Shooting indoor Recitals and other kid events having that F2 and going from 12,800 to 6,400 ISO makes a good difference.
The 135 1.8 Art is an awesome lens but I much prefer the 85 length. I've grown very fond of the 85/200 combo. Sure Canon needs to update the 200/2... it needs a slight weight reduction, 300 2.8 IS II optic quality and IS mode 3 as well but I still don't see the 200/2 being updated for another 3-4 years. Maybe Sigma will release a 200 1.8 art? That would be nice.
I shoot what I want when I want how I want.. The 200 lets me get what I want. If I want to move back I will if not then I shoot there. The 70-200 MK2 is an amazing lens too but it simply doesn't match the 200/2 ability to be at 2.8 @ 280mm which is important to me. I use the lens for alot of baseball and right now the fields I only need a 200-300 length. As my boy moves up then I'm moving to the 400 2.8 IS II and will probably swap the 200 out for the 70-200 at that point. Don't need two big honky lenses.
Something else to consider is the 200 F2 IS was the first lens in canon lineup to get "almost" the latest optics. It was released in 2008 next to the 800 5.8 IS which that body on the 800 now reflects the same body design in the 300/400/500/600/200-400. The 3/4/5/600 mk2 lenses were released ONLY 3 years later in 2011.
3 years means what? Ya we are still a ways away from a 200/2 replacement. Your really hard press to see a difference in optics between all the mk2 super whites and the 200/2 either. They are "very" close to the point you need charts to see anything.