No, gamma2.2/sRGB is how the pixels are stored on disk, not linear values. Linear is almost never used except as an intermediate for processing where you can throw lots of bits at it (eg, fp16/32 on a GPU when applying effects or whatever)
The difference is how the curves prioritize what bits to keep. Rec709 sacrifices the bright end to keep more detail in the darks, whereas log is more like linear perceptual brightness. So it'll have less low light detail but more bright detail by comparison
The difference is how the curves prioritize what bits to keep. Rec709 sacrifices the bright end to keep more detail in the darks, whereas log is more like linear perceptual brightness. So it'll have less low light detail but more bright detail by comparison