Hoy me he encontrado un post de un tipo aconsejando poner Gamma 1.9. Lo que dice básicamente es que una vez ajustado el brillo con el nuevo valor de gamma, se aprecia más el detalle en sombra sin sacrificar el negro brutal, teniendo un blanco más brillante y colores intensos:

The answer may shock you! (Has science gone too far?)

I recommend 1.9 (Low) gamma for just about anything on this TV. Let me explain. For me, the imperative on this TV was to have completely non-light-emitting black color, combined with high brightness. That's what I bought it for and paid through nose for. If it can't do that, I might as well just kept my old plasma.

So, for the first day or so, I kept the TV on gamma 2.2 (Medium) which is the default, and OLED light at 80-90 to provide high brightness that makes day viewing pleasant, and night viewing highly impressive. I have noticed that with these settings, I could not set the Brightness above 55, or else I was losing the perfect non light emitting black, which was visible in a dark room. I also realized that with brightness on just 55 I was losing shadow detail, and games and movies that had very dark scenes (games like Arkham Knight, The Order 1886 or Driveclub) had very compressed shadow detail that was almost impossible to see even in a very dark room, much less during daytime. I could easily see more shadow detail in these games on my old plasma. To make the shadow detail visible, I had to up the Brightness setting to 61-62, but at that point I had to say goodbye to perfect black color. I also noticed I could lower the OLED light setting to maybe 40 or so and regain perfect black color, but in that case I'd lose the impressive brightness this TV is capable of.

I really wished the Brightness setting was made to not affect the 0 black color on the TV, but it does. I found myself going into games and changing their in-game gamma setting to make the image lighter, something I literally never had to do on my old plasma. I then realized that I should perhaps instead change the gamma on the TV itself. I found out that predictably, changing the gamma on the TV does affect the brightness, but without changing the black color. I set the gamma to low (1.9) and dialed the brightness down to 51 and OLED light to 80, which produced the image that looked very, very similar to Gamma 2.2 / Brightness 61 / OLED 80 setting - but it regained the perfect non light emitting black. So my settings are as follows:

OLED 80 (or 90 during daytime)
Contrast: 95
Brightness: 51
Color range: Wide (this is actually locked to Wide if you enable PC mode on an input, and i think it corresponds to "Deep Color" setting on PS4)
Gamma: Low (1.9)

I honestly think this is the only possible setting on this TV that gives you all of this:
- Perfect 0 black
- High brightness
- Vibrant colors
- Good shadow detail

If there's other setting that can do this better, I'd like to see it. I was originally impressed with OLED 80(90) / Contrast 90 / Brightness 55 / Gamma 2.2 setting I used, until I realized the shadow detail was simply not where I wanted it to be, and indeed worse than my old plasma. The settings with low gamma I wrote above produce the picture that to me seems just about perfect in terms of brightness range, and it looks the way no other TV could produce
I have also confirmed with 16 and 32 step gradient ramp that each step is nicely and clearly visible with these settings.
Igual me animo y hago alguna prueba al respecto...