https://www.blu-ray.com/ is a great resource for 4K reviews. I have the same model Panasonic 4K player...it's great! You've picked some excellent movies to start with. The Godfather, Top Gun: Maverick, 1917, The Martian, Interstellar, Once Upon a Time in Hollywood, Lord of the Rings, The Shawshank Redemption are some 4K movies that I've really enjoyed. Some older movies like Vertigo, Citizen Kane, The Maltese Falcon, Casablanca, etc. also look amazing on 4K. Enjoy!