I'd say that the D does, perhaps offer improved results optically over the E series lenses but something to bear in mind is that those differences have only really been noticable by me when I've used them on digital bodies.
With film bodies, the film is naturally developed / processed and then usually scanned to a dgital file ( in my case, at home by me) ..........the weak point in the IQ is always the scanning.
If drum scanned by a lab then pretty much the results are generally, although not always, an improvement than what can be achieved by a flatbed scanner.
The point I'm making is that if you intend to use the lens predominantly on a film body then depending on budget, the E series may serve you perfectly well as by the time the negs are scanned to a positive image, the likelyhood is there will be little difference to see between the same shot taken with the D lens or E lens.......unless of course you're an obsessive pixel peeper
Personally I don't follow the often generalised view that E series lenses were for the "poor man" and as such they are carp ......They are perfectly capable of producing decent results in the same way certain togs are more capable than others at producing good photographs ....Gear is an important area to consider, but the skills,( or lack of!) , of the tog and the lab can easily turn an expensive camera like a Hassy or Leica image into a load of carp!!
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