I've got it set at variable and the highest bit rate, same with the Hikvision DS-2CD2342WD-I. I also tried looking on liveview with the Starlight set to the highest on constant and it didn't make any noticeable difference. I've exported captures, but my NVR will only let me do them in 1920x1080 - so the differences aren't as obvious as the Hik's native res has been reduced from 2688 × 1520.
The monitors used to the view the footage would also matter. My NVR has a 4K HDMI output and is hooked up to a 55" 4K TV, so what seems a small difference below is magnified once you take into account the resolution downsizing and viewing both on a large screen.
NOTE: The Hikvision compared below IS NOT a 3MP ULTRA LOW LIGHT DS-2CD2335FWD-I, it's "run of the mill"
4MP DS-2CD2342WD-I .
Enlarge both and look at straight line edges eg. the bottom trim on side windows of the silver car, the top of the letter box etc. Look at the lower text on the number plate as well.
I'll post some night shots locked in colour later. Then the Starlight makes a worthwhile difference.