I don't think it's an either-or situation because if you hire a talented and experienced cinematographer, they wouldn't use the wrong equipment...
Like anything else, lighting night scenes is both an artistic challenge and a logistical/technical/financial one. If you talking about a small shot like the close-up above, then most lighting equipment can achieve this look and it's mainly an artistic question of contrast, color, hardness, etc. of the light and the desired effect. It becomes more of a logistical, technical, financial issue when you try to scale this up for bigger and bigger spaces -- but you still have to have an artistic vision for the look you want before you can answer all the other questions.
In other words, equipment isn't much use if you put it into the hands of someone who has no ideas and no clue as to how to use it. On the other hand, a person with ideas and experience needs something to work with because he can't negate the laws of physics, at some minimal level, you need x amount of light to create x amount of exposure.
I don't think you can break down a whole project in terms of percentages of how much the camera, lens, lighting, or post contributes to the final effect. Even on a shot by shot basis, it will vary quite a bit.