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I don't know if its gamma, but the one on the left looks over lit and washed out, the one one the right is darker and looks nicer, but is perhaps a touch too dark (not by much though)

It's intended to be dark. The room is lit to have the minimum amount of ambient light required to have the neon backlights appear to be the primary light source

Left-hand one looks like gamma is too high, it's not particulalry sat-up but the overall effect is too washed out, Right-hand, slightly too low, suppressing some detail in the dark areas which would improve the picture without sacrificing the moodiness, which may be intentional.

I didn't touch the saturation only the gamma, look at the dark parts of the Rh picture and you will see more detail and in the lh the background is pulled down a little so overall the picture is less washed out. A proper grade would then pull the skin tones by product back, I was only showing gamma.