On DropBox I have a bokeh sample of the 135 DC on the _worst-ever_ background subject--- sprayed and dead,brown,ugly, Himalaya Blackberry vines! With a lovely 35 year-old woman in front of the vines. As you can see, at f/5.6, it does "okay".
85/105/135 AF series screwdriver focusing lenses
To me, the 135/2 AF Defocus Control lens was good for low-light, and was used by the Statesman-Journal's Ron Cowan for a number of years, before he retired. He literally wore the paint off the lens shade, from where he carried this lens on a second body... (see attached photo). This is the AF, pre-D model.
stage lighting, hand-held from balcony,100 feet away or so, f/2.0 at 1/400 at ISO 1,000,D3x
I don't want to imply that this lens is not sharp; it is sharp. But today, in 2018, there are newer lenses that are more crisp, and almost "perfect" in the way they render; Destin sent me some high-megapixel .NEF files from the new Sigma 13mm f/1.8, Christmas lights at night, backlighting a lady's portraits...the new Sigma 135/1.8 is uber-sharp.
The last time I used the 135 D.C. was a school play some years ago...I have a few frames still on my DropBox but this computer has had prtetty much all 135 DC stuff cleared off years ago..Here's one shot from about 100 feet away, hand-held at 1/400 second, ISO 1000, Nikon D3x 24MP camera, at f/2.0. As you can see, the plane of focus is at a slight angle to the stage, but where the young actors are aligned with the focus plane, they're pretty well-recorded and sharp. Note the people at the left edge,and the lower right corner, right at the frame edge,quite sharp. .