Quick answer
The Panasonic DP-UB820 (under $1,000) is the better player: it supports both Dolby Vision and HDR10+, has Panasonic's HDR Optimizer for tone mapping and 7.1 analog outputs. The Sony UBP-X700 (under $500) plays the same 4K discs with Dolby Vision (no HDR10+) at a third of the price, and it plays SACDs, which the UB820 cannot. Buy the UB820 for the best picture, especially on a projector; buy the X700 for 4K HDR on a budget.
🔗 Streaming as well as discs? Our best streaming devices for home theater guide ranks the Apple TV 4K, Shield TV Pro and Roku Ultra on Dolby Vision and Atmos support.
Panasonic UB820 vs Sony X700: Comparison Table
| Panasonic DP-UB820 | Sony UBP-X700 | |
|---|---|---|
| Price | Under $1,000 | Under $500 |
| 4K Ultra HD Blu-ray | Yes | Yes |
| Dolby Vision | Yes | Yes |
| HDR10+ | Yes | No |
| HDR Optimizer / tone mapping | Yes, adjustable for your display | Basic |
| Video processing | HCX processor, reference-grade | Good |
| Atmos / DTS:X passthrough | Yes, dual HDMI outputs | Yes, dual HDMI outputs |
| Analog audio outputs | 7.1 + dedicated stereo | None (HDMI/optical only) |
| SACD playback | No | Yes |
| Build | Heavier, premium | Lightweight, compact |
| Best for | Best picture, projectors, AV fans | Budget 4K HDR playback, SACD owners |
The table above compares the Panasonic DP-UB820 and the Sony UBP-X700 on HDR format support, tone mapping, audio outputs, SACD and price. The difference that decides it for most buyers is HDR10+ and tone mapping, which the Panasonic has at under $1,000 and the Sony lacks at under $500; for music collectors, SACD support swings it back to the Sony.
Tone mapping is how a player or display fits an HDR image graded for a peak brightness far above what the screen can actually reach into the range it does have, deciding which highlights keep their detail and which clip to white.
Why the Gap Is Bigger on a Projector
Projectors reach far lower peak brightness than TVs, so how the HDR image is squeezed into that range matters more. The UB820's HDR Optimizer lets you tell the player what kind of display it feeds, and it does the tone mapping itself, which is why it is a favorite in projector rooms. On a bright OLED or LED TV that tone maps well on its own, the X700 gets much closer. See our best 4K Blu-ray players ranking for the full field, including the reference Panasonic DP-UB9000.
Sony UBP-X700 vs UBP-X700K vs UBP-X700U: Same Player, Different Suffix
Searches for "Sony UBP-X700K vs Panasonic UB820" or "UBP-X700U vs UB820" are asking about the same comparison. Sony's model number is UBP-X700; the letters after it on Amazon and retailer listings (X700/M, X700K, X700U) are stock and bundle codes, and the specification sheet Sony publishes is the same for all of them: 4K Ultra HD Blu-ray, Dolby Vision and HDR10, Dolby Atmos and DTS:X bitstream over two HDMI outputs, SACD playback, and no HDR10+. Dolby Vision arrived on the X700 through a firmware update after its 2018 launch, so update a new unit once before judging it.
The Panasonic side is the same story: the DP-UB820 is listed as DP-UB820-K in North America (K is the black finish). Whichever listing you buy from, the verdict above holds. The UB820 adds HDR10+ and the HDR Optimizer; the X700 adds SACD and costs about a third as much.
Choose the Panasonic DP-UB820 if…
You want the best possible UHD picture, support for both Dolby Vision and HDR10+ discs, superior tone mapping, and analog audio outputs for legacy gear.
Check Panasonic DP-UB820 on Amazon
Choose the Sony UBP-X700 if…
You want reliable 4K HDR and Dolby Vision playback at the lowest price, you own SACDs, and you do not need HDR10+ or advanced video processing.
Frequently Asked Questions
Panasonic UB820 vs Sony X700: which should I buy?
Buy the Panasonic DP-UB820 if you want HDR10+ support, Panasonic's HDR Optimizer tone mapping (especially valuable on projectors) and 7.1 analog outputs. Buy the Sony UBP-X700 if you want Dolby Vision 4K disc playback at the lowest price, or if you own SACDs, which the X700 plays and the UB820 does not.
Does the Sony UBP-X700 support HDR10+?
No. The Sony UBP-X700 supports Dolby Vision and HDR10 but not HDR10+. The Panasonic DP-UB820 supports both Dolby Vision and HDR10+, so it can read the dynamic-metadata layer on any 4K disc regardless of which format the studio used.
Is the Panasonic DP-UB820 worth about three times the Sony X700?
If picture quality matters to you, yes. The UB820 adds HDR10+, Panasonic's HDR Optimizer for better tone mapping, and analog audio outputs. The Sony X700 is a great value player, but the Panasonic is a step up for a dedicated home theater, and the gap is widest on projectors, which rely on good tone mapping.
Does the Panasonic UB820 play SACD?
No. The UB820 does not play SACD discs; the Sony UBP-X700 does. If you have a Super Audio CD collection, that alone can decide it in favor of the Sony, or you can step up to the Sony UBP-X800M2.
Do both players support Dolby Atmos?
Yes. Both pass through Dolby Atmos (and DTS:X) bitstream over HDMI to your AV receiver or soundbar, and both have a second HDMI output for audio, so either one delivers full immersive audio from compatible discs.
Which player is better for a high-end home theater?
The Panasonic DP-UB820 (or the step-up DP-UB9000) is the better fit for a high-end setup thanks to its video processing, dual HDR support, and analog outputs. The Sony X700 is better suited to budget or secondary systems.
Is the Sony UBP-X700K or UBP-X700U different from the UBP-X700?
No. UBP-X700, UBP-X700/M, UBP-X700K and UBP-X700U are listing codes for the same Sony player: Dolby Vision and HDR10, Atmos and DTS:X passthrough, SACD, no HDR10+. Compare any of them with the Panasonic DP-UB820 and the answer is unchanged: the Panasonic wins on HDR10+ and tone mapping, the Sony on price and SACD.
Researched from manufacturer specifications and verified owner reviews, not hands-on testing. Prices are approximate and change often.