...just for portraits once in a while where the subject often does not want every pimple showing maybe it is fine to keep using the old D version you already have.
Sort of... :-) Just looked for my test shots with the 1.8D, but unfortunately I seem to have deleted them.
No, I wouldn't say the lens is good for making skin look better. I already saw that in another thread, I find it rather strange to "blur things up" to make skin appear cleaner. This is a case for good retouching, not for hazy lenses or modes that lose detail. I would rather say, practice how to properly retouch skin – not with fully-automatic barbie-skin tools like Portrait Professional, but with Photoshop. Yes, it does depend on the job and whether you have the time for it or not, but I personally would rather have one really great-looking image than ten fully-automatic barbie-skin-retouched images.
Plus, when I shoot at 1.8, I still enjoy a tack-sharp lens; you would look for very shallow DOF, but not for hazy eyes (the point of focus), right?