"...Obviously a different scene, about 50ft, but the 5442 S3 Z4 as far as I'm seeing right now, is superior in B&W/IR to the 54PRO Z4"
Yes, that's exactly what I think also. This B54PRO-Z4E makes me want to like it, but the B54IR-Z4E-S3 beats the stuffing out of it in terms of low-light capture, sharpness, evenly lit IR, and lack of digital artifacts. Since I have a 4K-X on my driveway, I use it for color identification, but if someone was only able to use one camera for a particular placement, I can see how this could serve double-duty with both IR and warm LED (smart illumination). As an example, I did a search for "Guitar Man" on my NVR and found these clips from a few weeks ago. The B&W of the B54IR-Z4E-S3 is superior to the B54PRO-Z4E, but the latter has it beat for color in the daytime.