Yes the pro is worth it. When I played Rise of the Tomb Raider with it's high framerate mode, the game is super smooth with 60fps and the visual quality improved a lot when I switched it to enriched visuals mode.

Skyrim is my personal favourite. The graphics looks so much better on the pro compared to running on the original ps4. 

Here's some of the latest comparisons between Pro and base PS4.

Rise of the Tomb Raider

The Last Guardian

Battlefield 1

Gravity Rush 2

Diablo III
Currently there is still no way to record footage with HDR but these 5 games don't have HDR function. Though I would recommend with all tech upgrades, don't listen to what others say. Go to a store, find a Pro and test it out yourself.

It depends on how the developer patch the game for the pro. Some games like Skyrim, I can see a difference while other games like FF15, I don't see any improvement except the fan on my pro doesn't sound like a jet engine now compared to my old ps4.

why not keep both?