Well I've had issues with the black level of my TV since day one. (55OLEDB6) ... my SDR blacks have always been 100% perfect, at least as perfect as I can judge in a pitch black room, in the middle of the night. No difference between on and off.
When it comes to HDR, black levels have been garbage. Like really horrible. I'm not talking about a glow, but more like elevated well above a simple glow. Looking like an old plasma, MUCH worse than my Kuro 9G which had 99% perfect blacks (about 0.001nit or 0.0003 fl)
Anywhooo... Updated to 5.30.60 , didn't even think much of it as I basically gave up every getting blacks fixed... Started watching an HDR series on Netflix when I noticed the credits when PITCH black, as if it was SDR. Which shocked me, watched more HDR content and the blacks looked inky, as they do on SDR.
... BUt the glow is there, it's not perfect. Just bought Devil May Cry 5 and Red Dead Redemption II, and I'd rather keep playing them in SDR over HDR because I prefer the perfect black over the glowing black. So it certainly helped, but not completely fixed.
Just installed the 05.30.65 patch. Will do some torture tests and see if this has FINALLY fixed black levels completely...