Of course I turn that thing off since it made it's debut
It removes the blur on fonts that were not made for ClearType = all older and widely used fonts. Plus ClearType uses subpixel smoothing and adds colored fringing to all text which is damn ugly on top of it's blur.
You can also disable smooth edges of screen fonts in Win settings but that disables smoothing on fonts made for smoothing so they tend to look very different and thin, I don't disable that and they are used on some of Win (dialogs with newer fonts) and M$ apps (Office and other apps that may use this WinAPI etc. to render their output, menus, ...). It doesn't disable it for all Win dialogs and menus either (not unless you would start replacing the font with some other, if that is still possible in Win10, used to be very easy 95-XP).
Many modern apps control how they render text anyway, by what text renderer they use, with what settings. If you use Chrome you're screwed as they removed the dwrite settings option years ago now and forced default to be smoothed blurry for everyone (no sharp font on Wikipedia, OCN, ... most of web really, for you).
My camera not only reports color temperature in 100k steps but also XY color coordinate = tint.
This will show you gamma across all colors at 3 different brightness levels: http://www.lagom.nl/lcd-test/gamma_calibration.php
This does show whether gamma is 2.2 at that brightness level too or not as well http://www.lagom.nl/lcd-test/sharpness.php
Brightness of the color shown, monitor brightness should have no effect unless it's some garbage monitor that changes it's internal image processing based on set backlight brightness.