Welcome to LTG!
I have a '76 D-50 and '92 D-55... so can give you a bit of a comparison.
The D-55 was introduced as Guild's "top" production model in the late '70s. Sitka spruce top, rosewood back/sides. Bound neck and headstock, pearloid block/abalone wedge fret markers, with pearloid "G-shield" logo on the headstock. Sometime in the 90s, rec'd scalloped bracing (mine is scalloped) and pearl rosette inlay (mine doens't have pearl rosette inlay). Mine has a maple bridgeplate, and a thin "fast" neck, with wider, but lower (?) "jumbo" frets. Tone is rich, fat, and smooth, with gut rumbling bass. Reminds me of a big grand piano. Some would call it "majestic tone"... can't say I disagree.
The appts of the D-50 are a little more spartan. Again, sitka over rosewood, but with unbound neck, dot fret markers, and "Chesterfield" headstock logo. Mine does not have scalloped braces (they appear to be shaved), but later ones are scalloped. Mine has a rosewood bridge plate, and a beefier neck (tho' still very comfortable). Tone is also very rich with gut rumbling bass... but mixed in with more mids and trebles that give it more jangle... mine is louder and more "in your face" than my D-55.
I've never heard the DV-52... but know that it is very highly though of in these parts. I'd love to A/B/C 'em all, sometime.
Good luck in your search,
another Dave