I have seen Joker. Very good movie, I would probably rank it as this year 3rd best movie I've seen so far. Great Joaquin Phoenix performance as titular character. Obviously, not a typical comic-based movie.
I meant "top3 of this year". Anyway, it would be Parasite and Once Upon a Time... in Hollywood before Joker. And maybe, just maybe I would also rank Linklater's latest (dont remember title right now) higher than Joker. But all these mentioned movies have been released relatively lately so I might unintentionally skip great movies from the first half of this year.