So,...
My very first real world shooting on the new 1DX MarkIII was almost exclusively with this "oddball" lens.
I hope to have images up to start a thread in the archive this weekend,. but for now, I was correct in assuming this focal range is the ONE lens for use for theatre work, and I suspect much performing arts.
I was shooting a dress rehearsal of Shakespeare's RICHARD III with it,
In case this was a flop, I had standing by the 24-70mm on the 5D3 and the 70-200mm (both f/2.8) in the bag ready to go.
I picked up the 24-70/5D3 for some wider scenic shots once.
I never switched to the 70-200mm and in the end shot about 865 of the 880 images with the 1DX and the 35-150mm.
It's "poky" af was a little bit of a bummer, but it did not stop me from enjoying the lens at all. If the distance it need to rack were short, I barely noticed,. it was only when a significant range change occurred that the slowest was noticeable.
Also, although it was slow,. and thus confidence was in question during the hoot, on the 1DX3 it turns out I essentially got 100% sharp in focus images! So paired with the right camera, this lens is just fantastic!
The focal range was spot on. I did not miss the 151-200mm end of the range much at all for this particular play, though I am sure I would have been at 200mm some of the time If I had it for head and shoulder shots.
As mentioned I had 24mm available by my side, and essentially did not use it.
BUT, if I had been shooting the "normal" pair, 24-70mm and 70-200m,, I would have been swapping back and forth like a mad man, and I would have , as I have SOOOO may times in the past, missed the best framing due to having the wrong body/lens combo in hand at the wrong time.
The 35-150mm absolutely eliminated that problem. At no point was I ever holding the wrong camera, I did it all with one.
Did I wish it was f/2.8 at the long end? Oh yes,. but modern sensor and Auto ISO left me pretty happy.
Did I miss the SP's super fast AF? Yes indeed,.
..but I will be keeping this lens!