Blu-ray and 4K are totally different concepts but when used in DVDs they can be compared together.
Should I buy a 4K blu-ray player?
Panasonic 4K Blu-ray Player with Ultra HD Premium Video Playback and Hi-Res Audio - DP-UB154P-K
What is 8k Resolution? Expectations from 8k Resolution
Panasonic 4K Blu-ray Player with Ultra HD Premium Video Playback and Hi-Res Audio - DP-UB154P-K
Why owning a 4K Blu-ray player is both smart and stupid
4k vs Blu ray Screenshot comparison : r/4kbluray
Titanic 4K UHD (1997) - Page 96 - Blu-ray Forum
Blu-ray vs 4K: An In-depth Analysis
Disney Reveals Full Details Of 'Aliens', 'The Abyss', 'True Lies' And 'Titanic' 4K Blu-Ray Releases
OLED vs 4K: What's the Difference?
Terminator 2: Judgement Day - 4K UHD vs Blu-ray
What Is 8K? Should You Buy a New TV or Wait?
