Argh, too many models --- lol
pretty much the same as the Z (4x)
The 8231 is an UltraWDR, not an UltraStarlight.. it does have starlight capabilities, but not Ultra Starlight capabilities that your paying for.. that money gives you no better low light capabilities, just a stronger DSP that can handle 140dB WDR and SSA.. it runs same IMX291 found in the Eco Savvy starlights.