I've brought 180G copies of my favorite LP's. Most were definitely better then the old pressings. But as @vonhelmholtz stated, it all depends on what company did the new pressing. Getting opinions is your best bet on which ones are better or not.
I would recommend The Robert Plant/Alison Krauss release on vinyl as a great recording. Although, I cannot tell how much of it was analogue vs. digital recordings/mixing. A good sign in my point of view. My turntable/cart combo is around $5K, just FYI.