I believe I can shed some additional light on this topic from the 4K perspective. I have the Sony 75" x850e - I mention that because the settings nomenclature differs from one brand to another. Also - be sure to read the manual that came with your TV. ON THE SONY TV, 4K UHD INPUT IS POSSIBLE ONLY ON HDMI 1 AND HDMI 2. I ripped-out what little hair I had left because I didn't realize it. When I received the XG1v4 box, and after I set it all up, I was disappointed with the set top box performance. Some xfinity HD channels filled the screen (ABC, NBC & CBS) and most others did not. On the channels that failed to fill the screen, the 1080P picture appeared centered on the 16:9, 2160P60 4K UHD picture that the STB was sending. This caused a wide black frame to surround the picture. For me, the fix was to change the TV screen setting from AUTO to Vivid. Change the UHD setting from AUTO to On. Presto. The XG1V4 now upscales all content to 4K, and the pictures are stunning. When the TV receives 4K Dolby Vision HDR10 content from 4K Apple TV or the Sony 4k HRD10 blue ray player, the pictures are not incrementally better than cable. But the XG1V4 is a wow.
One big task was to recalibrate the brightness, contrast, color, hue and everything else. The "Vivid" factory settings are designed to compete with every other UHD picture in the store , and if you try to watch it in a dark room you will need sunglasses. One comment about cables - I did need one more cable because the 4K Apple TV runs a test before it will turn on HDR10 and DolbyVision. But i didn't spend monster-sized bucks on a snake oil cable. There are excellent cables on line right priced for the amount of copper in the product. I added the link below because it's possibly the best made cable i've encountered for exactly the right price. The specs are quite good and it performs as advertised. I omitted the brand name. The link will take you to Amazon. The reviews you'll read there are absolutely true.
4K HDMI 2.0 Cable Link: http://a.co/2Faa4SW
This High-Speed HDMI Cable supports HDMI 2.0b including 18 Gbps, Mirror & Extend mode, UltraHD 4K 2160p (up to 60 Hz 4:4:4), HD 2K 1080p (up to 240 Hz), QHD 1440p (up to 144 Hz), HDCP 2.2, 48-Bit Deep Color, 21:9 video aspect ratio, Audio Return(ARC), Dolby TrueHD 7.1 audio and Hot plugging and multi-stream audio and video on this cable.
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Here are some things you can double check - in no particular order.
Did you upgrade your Netflix account to UHD 4K? There is a small monthly fee. (and by the way if you have any HD movies bought on iTunes, and if you get a 4K apple TV, then all of your purchased movies will upgrade to 4K UHD Dolby Vision if they are available that way)
In the DVR 'Device Settings'/'Video Display' is the maximum resolution set to "16:9,2160P60 4K UHD (Best Available)"?
In your TV Picture settings, is it set to (Auto)? Change this to (Vivid) and turn on (Auto 24P). I have a Sony 4K screen, so your settings nomenclature may be different. Just make the TV be on full 4K UHD as default.
It was my experience that the Apps in the DVR are provisioned over time. I think it may appear at some point. But you will not improve the picture over the Netflix app that's built into the TV.
If you set the equipment this way, then all HD channels and all programs will be seen in 4K. Note that you will need to make picture adjustments on your TV so that everything looks right. You can Google "(your TV model here) calibration settings" to gain an understanding of what you need to tweak - but thats another discussion all together. In my humble opinion, you should just watch Netflix on the TV app. The television makes beautiful pictures on it's own - the cable box is just unnecessary additional processing of the picture. Use the ARC HDMI input to get the surround sound back to your receiver. The big deal of the 4k box - one that seems to be lost on most posters - is the capability to upscale all programming to 4K if you set it up as I described. The one thing that caught my eye is how amazing the food commercials look - it's like looking through a window.
Hope this helps...
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I'm a bit confused by the worry over looking at Netflix in 4K on the Comcast cable box. All 4K LG OLED TV's - and most 4K TV's in general - will stream 4K from Amazon, Netflix, YouTube & Hulu right out of the box - just connect it to your WiFi or plug in a network cable, go to the appropriate app, and register your TV. I think the underlying question is "when will Comcast broadcast general television content in 4K?". Does anyone know about Comcast's plans to do that? [Or is 4K broadcast TV happening already without fanfare?] For me that would be the real driver to have the XG1v4 box. I feel like I want to have one just to be ready.
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