1939 was probably the best year for so many excellent movies.
I would tend to agree. Some of the best movies ever made were made in 1939:
Gone With the Wind
The Wizard of Oz
Mr. Smith Goes to Washington
Stagecoach
The Hunchback of Notre Dame
Goodbye, Mr. Chips
Ninotchka
Gunga Din
The Roaring Twenties
Dark Victory
Destry Rides Again
Beau Geste
The Women
The Rules of the Game
Of Mice and Men
Babes in Arms
Without a doubt!