Sequels (2nd movie only) better than the originals.
Toy Story 2
Godfather II
Spider-Man 2
Bad Lieutenant: Port of Call New Orleans
Evil Dead 2
Shrek 2
The Dark Knight
Bride of Frankenstein
Hellboy II
Road Warrior
For a Few Dollars More
Paddington 2
X2
Empire Strikes Back

Wrath of Kahn
Superman II
Batman Returns
Gremlins 2
Blade II
Legend of the Drunken Master
Desperado
Blade Runner 2049
Magnum Force
Final Destination 2
Captain America Winter Soldier
Swordsman II
Add others below.
PS It’s an unarguable fact Alien & Aliens are equal.

And I thought I put Terminator 2 on this list. It belongs.

You’ll notice a disproportionate amount of superhero movies on this list. The reason is origin stories are often boring and can be an extra element jammed into a story about a superhero vs. a bad guy, instead of being an organic part of the story.