My 135 DC has cured my 200 f2 GAS for now.
It took a while to get it right with the D750, but now it's tuned properly it's sharp as a scalpel, even wide open !
Apart from the bokeh, the 135 (and 105) DC lenses are designed to focus the red wavelength on a slightly different plane, and the skin tones it renders due to that are unique.
Subtle, but unique.