rrob I do not have anything 4k to display on. So I cant tell you the difference. I do have a 4K card in mycomputer but it is displayed on a "normal" tv or monitor. I cant justify buying a 4k display device (monitor or TV) with so little up there being 4K. You can tell a little difference in the level of detail but I'm sure you cant really appreciate it without a 4k tv. Of course I might not be able to tell a huge difference or it may be game changer for me...but I just dont see the value of it right now with nothing but a few feeds and preview channels.
Sorry this isnt super helpful. I wanted to be able to watch anything broadcast in 4k but just not in 4k yet LOL.

Also the H265 channels have all switched to mpeg or h264 on Anik F3 listed above.