Yes, 1939 was magnificent. But there were plenty of dud years in the yesteryears too. Just a few years later we had 1945 and 'Parasite' is better than any movie in that year. You can't pick and choose.
Here are some good movies from this century
No country for old men
There will be blood
12 years a slave
Parasite
Lord of the Rings Trilogy
Spotlight
Whiplash
Moonlight
Lost in translation
Spirited Away
Get out
And I understand movies can only become great over time. Time is the ultimate judge. I am pretty sure 'Parasite' and 'There will be blood', my 2 favourite movies from this century, will only grow in stature with time.