Four more questions:
1. Is the 4k (wired) faster than the J3 (in the guide, menus, etc.)? I don't care about 4k video, just speed for better ease of use.
2. Does the 4k have the same UI as the H3, or is it like the H+?
3. Does the 4k run Android apps like the H+?
4. Are there any known problems using a 4k with a H3 without the H+?