While I appreciate what
rad said, I would also state that your enthusiasm over 4K might be a bit "cart-before-the-horse."
4K standards (both physical and logical) are still being worked out. Aside from major sunk costs, this is why no local station, for example, has gone to 4K (they're not even at 1080p yet, because it would be a multi-million-dollar investment to go either way). If streaming uncompressed 4K takes a 12GB link (which it does), that should give you an idea of what's at stake here.
At this time, the only real benefit you'd have in upgrading is being able to watch a handful of shows/live events that DirecTV specifically broadcasts over its satellites. Notice that this is all being done Over The Air (OTA), and not by cable, per say (Comcast might have some content being delivered in this fashion, but I can almost guarantee it's strictly limited, per bandwidth issues).
Can you watch content on 4K discs? Of course you can, but realize that there's going to be far more content in 4K on that medium than there's going to be, broadcast-wise, for at least the next few years. Note that watching a 4K disc completely cuts out DirecTV in terms of content providing.
So, it's great that you've got some incredible TVs at your disposal that can do 4K, perhaps even HDR. However, via DirecTV, you'll effectively be using about 10% of their capabilities at this time.
It never hurts to wait.