David and Tom,
Thanks for your info as well. I just got a 4K display, and I'll probably get a 4K UHD player soon. I'm thinking about keeping my 103D, rather than getting the UDP-203 that will be released soon. If I do that, I'll probably move away from sending all video through my receiver, even though I also have another receiver that is 4K capable waiting in the wings. That's so I can customize the HDMI inputs on my display for different video sources. I might also run my Dish programming through my 103D again. I tried it in the past without much noticeable effect, but that was on a smaller display.
Custom UFW-15 (2)
Rocket RS850 (2), Rocket Bigfoot Center, Rocket RSS300 (2), Rocket RS250MKII (4)