Low-light struggles / improving image quality.

Nice. I like the apparent dark capabilities.

I have 2 5442 and they are good, but it could be better. Is the IPC-B54IR-Z4E-S3 a newer/better camera for night captures?
 
Nice. I like the apparent dark capabilities.

I have 2 5442 and they are good, but it could be better. Is the IPC-B54IR-Z4E-S3 a newer/better camera for night captures?

if you have 5442 in S3 variant (white/blue web GUI interface) - it's the same...
if older one (grey web GUI interface) - then newer...

Z4E means that this model have strong telephoto lenses - with zoom range 2x to 6x comparing to iPhone...