One of the (many) daily worries of a studio portrait photographer is skin tone, more specifically how different lenses (and RAW converters) mess up with your subjects/clients skin tones. The 105/2D AF DC as well as the 135/2D AF DC belong to that list of lenses which give you less gray hair than most lenses, simpy because the 105/2D DC paints v e r y natural skin tones.
The DC function (introducing spherical aberrations) is hard to learn and harder to use properly, and the screw-driven AF will produce more duds than an AF-S lens will. Put those aside, those two DC lenses are true gems and given the aftermarket price (105/2D DC goes for about 600-700 EUR, whereas 135/2D DC is about 700-800 EUR) it is hard for any studio photographer using Nikon DSLR to really neglect them. Yes, the 85/1.4G is outstanding, but it is a very different focal length and perspective than the 105 or 135.
The 105/2D DC is almost always in my wedding bag, where it sees use during dinner speeches and portrait sessions. The only lens that could take its place in my bag would be an AF-S 105/1.8 G/E Nikkor, but so far the news on any updates of this lens have not materialized. Some argue that the 105/2.8G AF-S VR Micro-Nikkor is sharper (true), but it is one f-stop slower and more importantly - in this World there exists no bride who likes to see the skin detail the Micro-Nikkor is capable of resolving (which effectively renders it unusable for wedding documentaries bar close-ups of the rings). The 105/1.8 Ai-S is clearly inferior in detail, skin tones (too cold) and overall character when shot wide open and compared to the 105/2D DC.