The three main physical media disc standards are DVD, Blu-ray, and 4K UHD Blu-ray — but not every 4K UHD Blu-ray release is created from a 4K source. Considering 4K UHD Blu-ray discs cost much more than their traditional Blu-ray counterparts, is the upgrade worth it when upscaling is doing most of the work? A true 4K UHD Blu-ray release is based on a 4K film scan or a 4K digital source, otherwise known as 4K digital intermediates. Plus, 4K UHD Blu-ray discs support higher bitrates than standard Blu-ray discs, so they can take advantage of the high-bitrate 2K file. While 4K UHD Blu-ray discs produced from a 2K file will outperform a standard Blu-ray, 4K UHD Blu-ray discs produced from a native 4K source are more likely to blow you away with incredible visuals.