As part of my not-wildly-successful effort to understand what panels are in what products, I did compile this list of the Apple desktop displays > 4K, < 6K:
iMac 27"
LG Display LM270QQ1-SDA2 LM270QQ1-SDB1 LM270QQ1-SDC1
AH-IPS (WLED edge backlight)
27.0" - 5120x2880 - 60Hz - 1200:1 contrast
440 cd/m² - 8-bit depth
iMac 24"
LG Display LM235UH1-SDC1 LM235UH1-SDC2
IPS (LED edge backlight)
23.5" - 4480x2520 - 60Hz
500 cd/m² - 10-bit depth
Apple Studio Display
LG Display LM270QQ2-SPA3
IPS (WLED bottom edge backlight)
27.0" - 5120x2880 - 60Hz - 1100:1 contrast
540 cd/m² - 8-bit depth + FRC - 99% DCI-P3 - 100% sRGB - 89% Adobe RGB
Two minor points of interest: [1] the 1200:1 contrast in the panels used for the three Retina 5K iMacs is better than the 1100:1 contrast in the LG UltraFine 5K and Apple Studio Display panels, and [2]
@PaulD-UK the industry spec* for the LM270QQ2-SPA3 cites the 89% Adobe RGB number, so that's where RichVision found that for their comparison to "a certain fruit" (某果)
* In Paneloook.com, for industry outsiders like us, the industry specs only appear when you use the comparison tool -- otherwise, the overview pages are not always accurate. Unfortunately, they won't sell you the definitive, detailed industry spec sheets unless you can prove that you are actually a business that buys panels.