The 4K discs offer better color (HDR) and improved encoding of the 2K DI, but the included Blu-rays are identical to 2011. Keep your Ultimate Edition Blu-rays for bonus features. 9. Conclusion The Harry Potter Blu-ray landscape is fragmented, but the Ultimate Editions remain the peak of the format for this series. They offer the best video quality, exclusive documentaries, and collectible packaging. The Wizard’s Collection is for deep-pocketed fans only. Standard box sets are fine for casual viewing but lack legacy extras. Avoid early MPEG-2 discs at all costs.