LTS 4MP Turret IR Quality or Stick w/3MP?

[postpremium]

I'm trying to decide between LTS 3MP or 4MP turret (CMIP3032 vs CMIP3042 vs CMIP3042W). Does anyone have an experience with 4MP models and their IR quality? Don't want to opt for the higher MP and be stuck w/crappy IR. Thanks in advance.