First of all I have to agree that the establishment of the receiver was really good and easy. Now the device is to 4k can yes. I see no chance! When tested with my 3D Player, there was a very ruckelliges image. Have the cord plugged directly to the player and good wars. Now I can not however switch between sources and that I had hoped for me. AirPlay and network connection seem to work well Maybe I can still write a what's wrong with the HDMI use.
Addendum: In manual (unfortunately only electronically) I now have a Note: 4K at max 30Hz / 1080p at 60Hz max. For 1080p in 3D are not information. I assume that the number is insufficient Hz. The RX V777 has in 4K 60Hz, but I find too expensive and the question remains whether the picture is better there.