Yep 90-120 is the standard (I found 120 a bit too bright for my liking) range for a well calibrated monitor. It looks natural and easy on the eyes regardless of a completely dark room or blinds fully open on a sunny day. Not found any probs with gaming either as have been using this for years since getting the i1Display Pro. Dark areas in Cyberpunk for example are nicely dark aside from the IPS glow - Obviously that will be a thing of the past with QD-OLED.
I noticed that Xrite have merged with Calibrite and sell a new calibrator called Calibrite Plus and Pro - I just installed that software which is a mirror of i1Profiler and it detects my i1Display pro which is good. I will use that on the Dell and see what's what as I notice in the dropdown that the backlight type has OLED listed, not sure if it should also list QD-OLED however but I guess I will have to run a calibration session and then do a quality test to see what it reads. As long as it reads accurately that's all that matters.
It's going to be weird going back to storing icc profiles for the GFX card's LUT as I currently use LG Calibration Studio which stores to the monitor's hardware LUT so the icc profile it creates actually makes no difference. It does mean that every time I update the GFX card driver there is a chance that I will need to recalibrate because nVidia could change how colours behave in the driver etc. I use nVidia Studio drivers so that won't be too often thankfully.
Edit.
Tom's Guide have a review now up too, not read it yet as the LG is calibrating just so I have a recent run to compare against soon lol.
https://www.tomsguide.com/reviews/alienware-34-qd-oled-gaming-monitor-review
Edit2*
Done, after so many years this LG continues to impress, to give you an idea of the ambient brightness I normally edit and game in, here's a pic:
Results: