That's because they are VDSLR lenses and therefore made so you can pull the aperture as well as the focus.
I don't speak about the aperture-ring, of course they have one. I just speak about composing the picture at the full open aperture, but the aperture is closing automatically on taking the shot. This is controlled electronically with a chip in the lens.
And they're not all VDSLR-Lenses, mostly exist two variants... for exaple one for still cameras (35mm f1.4) and the video one (35mm t1.5)
5DC, 5DM3, 85 1.2L II, 80-200 2.8L, 100 2.8L IS, 14 2.8, 35 1.4, 75-300 IS, 135 1.8, 40STM, 24-85, Helios 44-2, Zeiss Lenses, and real cams like Zenza Bronica ETRSi or Fuji GX680