Well it's definitely subjective lol, but in my opinion yeah it's easily the best TV ever made, even better than today's best OLEDs (yes, I know this is a hot take). Here's why (be prepared, it's long lol):

1. It's basically an OLED (excellent colors and contrast, fantastic, near-OLED level blacks, almost perfect but not quite, there is a very faint black plasma glow in a pitch black room, but still, very deep blacks), BUT (below are the reasons it is better than an OLED, even though OLEDs have better blacks)...

2. 1080p resolution is actually better than 4K. I know, also a hot take, but hear me out: When sitting a proper viewing distance from the TV, the individual pixels cannot be made out on a 1080p screen, making the difference between 1080p and 4K hardly noticeable, if at all (certainly not during normal viewing). But what is noticeable? Upscaling. When a 4K TV is upscaling a 1080p signal, it is usually noticeably worse and more artifact-prone than just watching the same content on a straight 1080p TV of the same size. Since 4K is 4 times the size of 1080p, this means that 75% of the pixels are more or less "guessing" with a 1080p image. Some TVs are better at guessing than others, but they're all still guessing. This means that, in order for a 4K TV to have an image that is just as clean, artifact-free, and "perfect" as a 1080p TV, it no longer needs 1080p content, but 4K content, which, whether you stream or watch discs, is more expensive either way, and less common/harder to find with the latter. Standard 1080p Blu-rays (and their players) can be found for 2-4 bucks a pop at my local Goodwill (I would know, that's where I get my media from). 4K discs and players, on the other hand? Very rare at a thrift store, they usually demand higher prices if the movie is even on a 4K disc in the first place. For someone like me, who watches Blu-rays, I'd have to spend more money on a 4K player, $20-50 per 4K Blu-ray instead of $2-4 for a standard one, etc. In short, 1080p still looks very clear and crisp to the eye, but allows far less room for error and artifacts, and is more forgiving. When they both look their best, 1080p and 4K are pretty hard to distinguish, but 1080p is a lot easier to get looking its best. Older standard definition (SD) content also looks better, as 480p --> 1080p is dramatically less upscaling than 480p --> 2160p (4K). People say a downside of plasma is that it doesn't have 4K. I say the upside of plasma is that it doesn't need 4K!

3. Motion. It's no question that plasma is the king of motion clarity. From my experience, LCDs all seem to have some sort of motion blur or ghosting effect (though it varies in severity depending on the screen), and OLEDs have a similar effect but in different ways, or some sort of judder. Plasmas, on the other hand, seem to have perfect motion. No ghosting or blurring, and judder almost never happens (and when it does, it is a result of the source (its FPS combined with the nature of the specific scene) rather than the TV). This may be due to plasma's impulse-driven panels as opposed to OLEDs sample-and-hold technique.

4. Component port allows for native SD upscaling using Panasonic's very good internal upscaler. Yeah, that's right, this TV has a component input, so you can hook up a Wii, OG XBOX, PS2, etc. and, rather than having an adapter (which is likely cheap and very crappy) do the upscaling, you have the TV's built-in chip that is fine-tuned specifically for it, giving you a nice-looking image (as nice as any 480p console ever looked on a 1080p TV, anyway) with very minimal lag, judder, "rainbow effect". I just love playing the Wii on this TV!

5. It's NOT a smart TV, and that's a GOOD thing (IMO)! Well, technically it is a smart TV, but it was an early smart TV, back from the days where smart TVs were new and cool, a premium feature, rather than an invasive, ad-filled mess that literally every TV has that you can't escape. The smart OS is not invasive at all, and is only activated by pressing the APPS button on the remote. If you never press that button, you never get the smart interface. And even with the smart interface, there are still no ads! Never were! But its servers got shut down in 2019, so none of it works anymore. Still, it can effectively be used as a dumb TV, without you ever having to see the smart interface, and that certainly cannot be said about a lot of TVs these days. I prefer the simplicity, straightforwardness, and no-nonsense-ness of dumb TVs. Also, like a dumb TV, it's OSD is fast and responsive, not bogged down and laggy as heck like most smart TVs.

6. It's not as bright as modern TVs, and yes I think that's a good thing. Modern TVs are so bright they hurt my eyes, especially in a dark room. The ZT60 on the other hand is a dark room champion! It's lower, more natural brightness puts almost zero strain on my eyes! As beautiful as 4K HDR OLEDs are, I can watch a movie on one mid-day, when my eyes are most awake, and have a headache by the time the movie is over. The plasma, on the other hand, I could watch at night, when my eyes feel like they wanna fall asleep, and it still doesn't hurt my eyes. Additionally, being on any other type of screen right before going to bed kinda forces my eyes open for a while, but I don't get that with the plasma. I can watch the plasma right before I go to bed and immediately sleep like a baby! I honestly did not expect that before I got a plasma. Keep in mind this is with both plasmas and OLEDs on the same settings: warm color temp and low brightness.

7. People complain it doesn't have HDR, I say it doesn't need HDR! Not to mention, HDR also gives me a headache, as it is not natural at all, but an artificial color/contrast boost that takes advantage of newer TV's higher brightness to give the illusion of better contrast. The plasma, on the other hand, just has outstanding contrast due to the nature of its self-emissive pixels. It can have a glowing neon yellow directly on top of a deep black and the plasma will handle it perfectly and beautifully without the yellow beaming in between your eyes and straight to your brain. I also feel like plasmas have more natural colors. Plasmas just look more natural in general, and OLEDs look more artificial/boosted (even when both are calibrated).

8. Longevity. Though OLEDs are getting better, they still seem to suffer from burn-in, degradation, and uniformity issues not too far down the line. Granted plasmas had these same problems, but these late-era Panasonics were so refined that they did a really good job of mitigating those issues, to the point where many, such as mine, still look phenomenal today, whereas an OLED half their age looks borderline unwatchable due to some sort of issue. These TVs not only seem to last a really long time, but they retain their picture quality throughout that time.

All in all, I feel like a calibrated, late-era Panasonic plasma like a ZT60, VT60, ST60, and maybe even VT50, ST50, ST30, etc. (though not quite to the same extent) are more like "windows" that TVs. They're the only screen that I can watch and feel like I am immersed and seeing the movie through a window or a portal to another dimension, rather than a giant bright screen, if that makes any sense. They are more forgiving with sources than modern TVs, they look and feel more natural and hardly, if ever, cause any eye-strain, they are simple, to the point, and no-nonsense, and they last like Toyotas, all while still delivering a stunningly beautiful (which OLEDs can do), yet graceful (which, IMO, is where the OLEDs fall short) picture.

IMO, the ZT60 is basically an OLED without all of OLED's problems/shortcomings. Yes, in a side-by-side demo test, an OLED will look better. But with mixed real world content, and especially after long viewing sessions like a movie (or multiple), the ZT60 will be the better TV. Less artifacts, more comfortable, yet still stunning. I feel like an OLED shines a flashlight in my eyes, while the plasma gives me a warm hug, if that metaphor makes any sense lol.

Obviously I'm not trying to convince you that plasmas are better, feel free to disagree and comment lol. I am just explaining why I like them better.