Stupid Question Alert!!!

4K requires an ultra HD 4K Blu-ray player or Netflix 4K subscription.

only limited content is available in 4K

i don’t believe satellite (directTV) is anywhere close to 4K

the best 4K TV and possibly the best TVs ever created so far (for non-gaming applications like movies) is the latest line of OLED TVs from LG

the latest DSP receivers are 4K compatible - the introduction of 4K receivers has been a bit of mess though with copy protection built in to the very latest HDMI standard....and only a few receivers supporting it. The trick with older receivers is to use one HDMI out from the blu-ray 4K player to the TV and the other HDMI out purely for audio to the receiver....

If you have a bright room, oiled cannot produce enough luminance and the Sony Z series is a better bet, and, with the processing may actual be better than oiled. As to your AVR, suggest rather than just my answer, you pose this question over on AVSForum, where there is great expertise on all aspects of the visual displays. Take a look....but short answer is maybe, dependent on component age and capabilities.

the best 4K TV and possibly the best TVs ever created so far (for non-gaming applications like movies) is the latest line of OLED TVs from LG

The operative word there is "possibly". I have a Samsung UN65KS9800 (LED not OLED) pro calibrated by Kevin Miller. The picture is better than any OLED I've seen. Blacks are just as black as though the unit is off. 

Paul_Graham:  cable or satellite signal comes in at 1080i! Your TV upscales signal to 4k! Until they invent a way to compress a 4k signal for cable transmission, streaming and 4k players are your only alternative! Pennsy!

pennsy...thank you!