I am on my second lamp hour, and have finished tweaking the Z5 until the bulb has some hours.
The room is 95% light controlled, and the screen is tensioned blackout cloth. 92" diagonal screen with 13.3' throw distance and an 11' viewing distance. The screen is mounted on the inside of a dormer (covering a window), and the adjacent walls and ceiling is painted flat black. The only colour in the room to influence the room is a gawd-awful, er, I don't want to say "pink", er, it's not brilliant or anything! carpet.
Here's what I did: started with the "Natural" mode. Turned on one of the auto iris modes, set the other iris to -45 Did black and white levels (brightness and contrast) with Avia. I then checked all three color patterns in Avia using the filters, and I'll be damned if it wasn't almost perfect as is. Honestly, it only took a notch or two of color and tint on the basic menu to get the bars as perfect as I've ever seen. I then re-did white and black level, and re-did the colour bars.
Finally, I looked at the secondaries on one of the colour charts, focusing on yellow, since I have a fair idea of what yellow should look like, and tried the 5 color temperature presets to find the one with the most "natural" looking yellow. I hesitate to say what it was for me, because it won't necessarily be the same for you, but for posterity, it was the warmest setting (low 2 or whatever it's called).
And for what it's worth, I killed that sharpness feature and lowered the sharpness to -7. The picture is plenty sharp, but doesn't suffer from that artificial ringing, which I just don't like.
Tried out Fifth Element Superbit, and everything looked great. I've been fuddling with the one manual iris setting, but I think the bulb is currently still to bright for it to be working right.
I suspect I'm somehow trading off contrast ratio and the absolute black of the picture, but honestly, the correct colours is well worth it.
Perhaps I'll try something based on Living or one of the Cinema modes later to see what can be done, but for now, what appears to be a true and accurate picture will suffice.