I have a '72 D-35 (light build), and had a '78 D-35 (heavier build), and a '76 D-50.
The '72 D-35 (lighter) has a mellow, woody tone... quieter, certainly a bright, folksy tone, with sparkling trebles, but with a nice, warm bass presence.
My '78 D-35 (heavier) was louder, and had much more emphasis on the mid-range. It had sparkling trebles, strong mids, but I always felt it was a bit lacking in the bass register. It had brash and "in-your-face" presence...
My '76 D-50 also had an "in-your-face" presence, but had a much stronger bass presence typical of rosewood, while retaining bright sparkling trebles. I loved its tone for strumming, but it also sounded great fingerpicking ballads. Unfortunately for me, it had a very narrow neck... closer to 1-5/8" nut width (spec is 1-11/16"), and the fretboard had been (IMO) excessively rolled/rounded, requiring even closer string spacing and making the neck seem even narrower. Combined with a deep C profile, I found the narrow, deep neck fatiguing to play, and harder to finger cleanly. I finally sold it after buying my third DV-7X...