The new RED MX sensor specifications and capabilities:

Increased Dynamic Range
Mysterium-X has approx 13 stop of Dynamic Range or about  1 1/2  to 2 stops more latitude than original RED ONE Mysterium.
  
Noise - reduced noise - The new Mysterium X shoots about as noise free at ISO 800 as Red One did at 160 - 320.
  
New Color Space - More accurate color science and a new color space called RED Color

Red Gamma - A redesigned gamma curve, much like Redspace, that more accurately represents a “normal” greyscale on electronic displays.New FLUT Color Science is a new control for very fine ISO / mid grey adjustments without inducing clipping.