If all you want is a low-resolution monitor with good color calibration you can pick up an old Cinema Display for a couple hundred bucks that will do the same thing.

Not really. Those things were TN and they had CCFL backlight which yellows over time.

You must be thinking of another brand. Apple has never sold a Cinema Display with a TN panel, and the later ones were LED backlit.

Really? I thought IPS didn't even exist in those days.

But I still doubt they manage the same quality and colour depth as a current midrange display. I have some old Eizos from that era and they're no match for my 200 euro 4K LG.

They weren't IPS though but PVA..

The original cinema ones were IPS with ccfl that get hot enough to cook with.

When we replaced all of our Cinema displays and 2010-2012 iMacs, the next big request that followed was for space heaters.

I believe that, I had two of the 30in variety (150w a pop) - in the summer I had to run a fan across them to not feel like a rotisserie chicken.

I'm not sure you know how built-in hardware calibration works. A built-in arm on the CG swings out at a set interval and automatically creates a LUT for the screen.

Not sure why you are being downvoted. I purchased a Eizo CS monitor and I couldn't be happier

For coding, I'd take high resolution than accurate color, without thinking. So it depends on use case.

So 5k2k or 8k?

It's difficult question. Assume 5k2k 40inch (U4021QW) vs 8K 32inch (almost same height); 5k2k is great aspect ratio for single monitor setup, but dpi is moderate. 8k 32inch is too much dpi for 200% HiDPI. 8k 40inch is sweet spot for 200% but it's too big for monitor. Maybe I'd take 8K 32inch and use with 250% HiDPI, if prices are same.