For the most part, you’re safe upgrading your DVD and Blu-ray discs to 4K UHD Blu-ray. This is the best format available on the market, and if you value having the best audio and picture quality, that’s where you need to go. I’ve been very happy with my 4K discs, but there are some bad transfers. It’s bound to happen from time to time, but what’s annoying is that some of the most famous movies of all time have fallen victim to this.
