Exactly, IPC-HFW8232E-Z is superb and hard to replace with something better but the new 1/1.8" sensor is very good. You'll have same low light performance but double amount of pixels which means much more details.
From 2MP to 4MP it's a "wow", 4MP to 8MP is only a little bit better but overwhelms NVR or BI machine easily, because of the data rate, especially when you want more than the usual 15 fps. I run my 5842 at 3072x1728 (=5,3 MP).
This will need some handicraft work: