What are you all smoking?
Or have been smoking when you have been supposed to listen to your physics teacher?
Insect eyes are an early attempt at seeing by nature, superseeded by the incredibly more powerful complex eye with an iris. E.g., insect eyes destroy phase information and therefore have a severe diffraction problem.
Current sensors achieve better than 50% quantum efficiency. E.g., the K-5 sensor detects between 2.5 and 40000 electrons per sensel within its dynamic range. Which is 5 photons. Even less because much of the noise which limits dynamic range is part of the photon nature of noise.
The remaining progress in light sensitivity will be rather limited, remain below a factor 2 and the biggest progress will come from a different color separation technology, not sensors.
People promising a 1000-fold sensitivity to light appeal to investors who are known to have been smoking the same stuff