If you are buying for the PS5? then I'll strongly suggest that you wait till 2019 at best to get a 4k TV. cause not only would they be dirt cheap by then, buying one now would mean you are buying something that will be grossly underutilized and will basically be antiquated by 2019.

most of these 4k TVs today don't even come with HDMI 2.0, which means they won't even be able to support 4k at more than 30fps. and chances are, by the time the ps5 comes along the default input method may actually be USB type c and not even HDMI.

so wait.

I'll buy one once 4k gaming becomes the norm similar to how the last gen was the first gen that really had HD as a norm.

Most people that have HD tvs don't even watch much which is HD on there. My aunts and uncles literally only get to watch HD when they watch Netflix or if they happen to catch the show they like on a HD channel. They don't buy BRs and they certainly don't game.

Considering how consoles are struggling to get games to run at 1080p 60fps, and VR being a big push, I wouldn't be surprised if next gen is more about 2k 30fps instead of 4k considering the jump made from last gen to current gen in terms of performance.

How much media can be viewed in 4K at this point? Games definitely not, blu-ray nope, cable television I don't think so. Is Netflix in 4K? Are other video services in 4K?

To each their own, but I wouldn't get one until the stuff your watching is readily available at that resolution.

EDIT: If your thinking about the PS5....why not wait until its released?  You'll actually know if it can do 4K, and prices of the TVs should (theoretically) drop by then.

I'm not even considering 4K until I have a gaming machine that can utilize it or its cheap. Whatever comes first.

I got a 4K tv last year I spent £1k on it haven't really used the 4K at all but it will come eventually I hope, I know Netflix has some things that support 4K but I haven't found it.

It may be an idea to wait a bit though cause 4K won't be mainstream for a few more years.

Samsung TVs rely on over-saturation and over-bloom in order to draw attention away from lack of color depth and detail. Not only that, but Sony TVs are going to have both the better upscaling and better noise algorithms, meaning playing 1080p content on it will look far and away superior to its Samsung equivalent. As far as 4K content is concerned, the Samsung's are going to have significantly worse light bleed than Sony will. And finally, the Sony 4Ks are running Android TV, which is much more open-ended and supported than the SmartHub. 

Which TV should you pick? Well, you can make a bad  decision and buy a Samsung (or worse, an LG). Or you can get a Sony.

Only buy a 4k tv if

1. You sit game 4k ultra on PC
2. Have a 4k bluray player.
3. Can afford to spend extra $5 - 10 on 4k bluray.
4. Sit 6 or so feet away from a 40" plus TV, but even still, points 1 to 3 should be apple hear.

There is no need for a 4k tv if you do not do not do any of the above.

Above all, prepare for DVD'S, 720p content (amazon prime) and some 1080i coded bluray 's (of which there are many) to take a hit in picture quality.

In short not worth it, not even for "future proofing".

I'd say when the PS5 releases. it's likely that all new movies will support 4k, Netflix 4k mainstream, some games in 4k, TV channels in 4k. 4k tvs will be really cheap. That's my plan.

Games: HDMI 2.0 now GTX 980 ti, HDR soon http://www.fudzilla.com/news/graphics/39423-radeon-2016-gpus-supports-hdmi-2-0a-dp-1-3-and-hdr
Blu-ray: About 26 available on Amazon (4K Ultra HD)
Cable TV: My cable provider has one 4k sports channel. Too bad i don't watch sports.
Netflix: Yes. Too bad I can hardly watch Netflix in HD, streaming a constant 15.6 mbps and on a capped internet, forget it.
Other video services: Yes.

But indeed, readily available No. And blu-ray already has a bandwidth for picture up to 40 mbps. 4K streaming looks sharper in slow scenes, while blu-ray inevitably holds up better during action sequences.

I was first to upgrade to full HD, and that 2006 52" 1080p TV is getting on in years. Yet I don't feel the same excitement this time.
Maybe cause I just bought a HD ready tv 4 years earlier which wasn't all that ready after all. I'm extra cautious this time.

By this do you mean you are getting a TV in a few months in order to prepare for the future or that you like to think about it in advance but won't be buying one anytime soon? 

I just upgraded my internet a few months back to roughly 75 Mbps, much more than I personally need but we have 4 people living here and get a lot of visitors so I wanted some extra muscle. Hopefully, you can move and get your internet improved too!

Yeah, same with me. I thought 4K was the latest but then started reading about HDR and how that was even more important than 4K. I was like, why? We already don't have a ton of 4K content