It's meant to objectively separate the actual 4K work from upscaled 2K stuff - based on multiple sources, simple resolution binary answer. Not based on any personal experience or feelings about how it looks, that's for reviewers to decide. I agree they still look better, but not 4 times better...
Hey! I compiled this list: http://4kblurays.com/
I'll keep it updated.
Though it doesn't cover every nuance of each release, hopefully it serves as a useful guideline in your decision-making and managing future release expectations.
I think we can agree no one wants to waste money for something...