Great Z5 Review!
Well, after reading many posts, mostly speculation, about how bad the out-of-the-box calibration is, on the Z4 and the Z5 would probably be no better, it is refreshing to read a review that confirms my experience.
I don't know about the Z4, but I have been super satisfied with my Z5 right out of the box. The only adjustment I have made was to turn down the color a tad for the component input. That's probably because I use it for the HD satellite TV box. I use my upconverting oppo to feed DVD's via HDMI and the detail, color, sharpness, etc. is beautiful. My screen is a 100 inch Da Lite da-mat, unity gain. HT is in the basement with pretty good, but not perfect, light control. I wouldn't recommend going bigger than 100 inch unless it's a higher gain, or you can make your HT totally dark.
I have 104 hrs on it now which is long enough to notice any bugs and I'm happy to say there is none. The review is a mirror image of my experience, so far, with my Z5. Needles to say, I'm a happy camper.
Live long & Prosper,
Intradio