Here is what the Vizio M80-C3 will do with the Samsung UBD-K8500 4K Ultra HD HDR Blu-ray player.
1. The K8500 can output 4K @ 60 FPS 4:4:4 to the Vizio M80-C3 and it will pass the 4:4:4 test(See pictures Below). Yea I know. I didn't think it was possible either. I spent hours tonight just trying to get the stupid thing to go into 4K/UHD mode. No matter what I did I couldn't get it to do anything but 1080p. Then on a hunch I thought. Maybe this thing is sending out 4K @ 60 FPS 4:4:4 since those are the only options in the HDMI Color Format menu. I switched to HDMI 5 and set my receiver to accept 4:4:4 which wasn't turned on before. Then I swapped cables to some that I knew were high speed. And low and behold it suddenly went to 4K @ 60 FPS for all 4K streaming on Youtube. I render my videos to 4K @ 60 FPS and that was now working properly. Then I put the 4:4:4 png UHD/4K test pattern on a usb drive and couldn't believe it when it worked.
That is right the Vizio M80-C3 is most definitely capable of 4K @ 60 FPS 4:4:4. However, it only appears to work with the K8500 and not computers. Honestly, I don't know why this is but I am 100% certain the Vizio M80-C3 can accept 4K @ 60 FPS 4:4:4 from the Samsung K8500. I got a lot of drop outs from this with cables that marginally supported the 18 GB/sec data rate. Once I got good reliable 18 GB/sec cables, it without a doubt, passes the 4:4:4 test at 4k/UHD @ 60 FPS. I know no one will believe this until they try it so someone else please try this. Just put the 4:4:4 test pattern on a usb drive and plug it into the player. Please note that it must be a 10 bit test pattern or it won't work. I tried an 8 bit jpg version of the same file and it fails it.
2. Youtube works perfectly with 4K/UHD which is great since the Vizio TVs don't support VP9 decoding. It is great to have a solution that supports even UHD/4k @ 60 FPS youtube. My high end gaming laptop even struggles with UHD/4k @ 60 FPS youtube videos. The K8500 played them flawlessly without any dropped frames.
3. 4K streaming works great with Amazon and Netflix. However, none of them present any HDR options with the Vizio M-series. I am not certain that HDR streaming is working with true HDR TVs either. However, I am certain you aren't able to stream the HDR versions of the movies and shows with the Vizio M-series at the moment.
4. I can confirm that HDR material will work with the Vizio M-series. Now before everyone gets their panties in a bunch let me clarify what that means. It means that if you put an HDR file like the Life of Pi or Gods and Kings sample HDR files on a USB drive it will play them with proper color applied and they don't look washed out by default like they do when you stick the same usb drive directly into the TV. Now that isn't to say that the M-series is now an HDR TV. It most definitely lacks the color range to be considered wcg. However, it definitely can play HDR material without any issues and it definitely looks better than the 1080p or even 4K non HDR equivalent. It appears that the K8500 simply reads the headers and applies a REC.709 color profile to the output. However, it also appears that it leaves the output as 10 bit as well. I put the player in the RGB(Enhanced) color format and it does appear to offer a wider spectrum of highlight and shadow detail without any banding patterns that would occur with 8 bit material if you expanded the range so much. It is very obvious that the HDR material is graded differently than the 1080p Blu-rays are. I will try to take pictures of this tomorrow to demonstrate the difference. It is almost 2:00 AM here and I need to go to bed.
5. 1080p Blu-ray playback looks like any other 1080p Blu-ray playback. No better no worse. Just the same whether you stick it in 1080p mode or 4K/UHD mode.
6. This is a really great Blu-ray player. It starts and stops in a matter of seconds. My old Sony player would take almost a minute to start up. The remote is just weird though. Way to thin and awkward.
7. The dual outputs works great. However, I had to abandon them because I need HDMI 5 for my PS4 and computer. However, youtube through the K8500 only seems to play at 60 FPS for UHD/4K even if the video is 30 fps or 24 FPS. Therefore, I have to use HDMI 5 for the K8500 as well. That means that I have to chose a single default profile in the TV for all 3 sources. That default profile will have to be the one for the K8500 and then I will have to manually switch to the other profiles for the PS4 and the computer. It is a pain but it is worth it.
8. Netflix passes Dolby Digital + to my receiver and it shows a little plus"+" sign next to Dolby Digital on the front of my receiver. It freaked me out at first since I had never seen that before.
Overall the K8500 is an absolute Home Run for me despite the fact that I don't have an HDR TV and UHD HDR Blu-rays aren't even out yet. I highly recommend that everyone pick up this player especially if the price drops a little over the next few months. It is a truly wonderful piece of hardware. Yes it is plasticky and doesn't feel high end. So what? It works great and makes 4K a reality finally.