Anime has never looked as good as it does now. And it will only get better-looking in the future.
Lol, no. Here's a basic 80s OVA and it looks superior.
I'd use a movie example like Angel's Egg or Akira but I don't want to embarrass you.
I remember one time long ago, I wanted to fap, so I searched some hentai to have a quick fun. I ended watching several OVA because it was an old hentai (early 90's probably) that had some nice quality shading and good artstyle.
Depends pretty significantly on budget/studio.
Big-budget films are more gorgeous than ever from a visual effects standpoint, sure, although we still haven't gotten "better" than the stunning levels of detail and expressiveness featured in late 80s/early 90s big-budget flicks.
CG...can be good or bad, depending on how it's done. It's been done pretty shitty so far. I'm waiting for squeenix-tier pipelines/processes to work their way down to the cheaper animation studios so we stop getting eyeraped by shit-tier CG.
I dunno, bro.