I've been meaning to get this thread started for months. Here's some comparison screenshots I personally took of blu-ray and 4K releases of our favorite other worldly life form films, accompanied with lackluster analysis and/or random thoughts.

I'm going to start with Predator, but will be following up with some Alien and more Predator down the road.
Predator 2This is a really nice 4K release!
Zoom in on the detail between the buildings, the fire escape, and the cement ledge Mike Harrigan is on. The 4K release sure brings out a lot of extra, fine detail doesn't it? Thumbs up!
PredatorIn regards to extra detail, I was very disappointed with the Predator 4K release. Zoom in on the writing on the weapons crate or the paperwork to see what I mean.

I've read that the film cameras used in Predator 1987 were not the best, therefore perhaps is the reasoning behind why the 4K doesn't really bring out any additional detail in my comparisons to the Blu-ray. And sometimes to be honest, the grain experienced was insufferable, especially due to the constant use of fog machines used in production. So I personally choose just the brightened & digitally noise reducted blu-ray when it comes to Predator 87, waxy faces and all. Thumbs down on the 4K.
Hey let's go back to
Predator 2 and check out that high dynamic range! Well damn if those walls don't have a helluva glow in 4K!

Also, removing the brightened, then subsequent digital noise reduction work in the Blu-ray out of the process, the eerie shadows have returned making the City Hunter look that much more menacing. Nice!

That's it for now...