Just a few thoughts, as we expect a much smaller crowd today. Yesterday was packed - thanks to all that came!
From my poll of the six people left at the end of the day, it was 5 out of 6 thought the JVCs were the winner overall, both the RS640 and RS4500. People were coming in and out during the day, so there were some I was not able to query but will be following up.
Couple of issues I noticed being right up in the front at the screen:
The Sonys all looked slightly soft and "flat" to me. I used my usual closeup of Aaron Eckhart in a shot toward the end of SULLY that reveals fine details in the texture of his shirt. The RS4500 clearly revealed every stitch in the weave, while on both the Sonys the stitches were hard to make out. Of course, this is the stuff that is only noticeable close to the screen, but still was surprising to me. Even here I did not see that much difference with the eShift vs. the native 4K panels on the Sonys.
The JVC RS640 did look a bit dark, simply in terms of how it rose out of black (I agree with Jerry here). Another person shared the same thoughts, and Gregg and I thought they had a point. We went in during the last hour and tweaked the picture tone and dark level controls on the JVC and that brought the rise out of black much more in line with what was seen on the Sony. This tweak just adjusted the rise out of black but of course did not affect contrast. Even the two people I know of who preferred the Sony (including Jerry, clearly) acknowledged the clearly better black levels of the JVC RS640 over all the other projectors (inlcuding the 4500).
Today with the Sonys I am going to go into the service menu and use ArrowAV's tweak to override Sony's locked panel alignment and see if I can get back some Sony sharpness.
RE: Billy Lynn and banding with the 385. I didn't see any in the brief sequences we watched. However, when we played Billy Lynn on the 640, the wider color gamut was clearly visible.
Just my thoughts, mixed in with some shared thoughts from several others. Hopefully others will join in.
Gregg and I are also going to play with the HDR contrast setting on the Sony's a bit more today. During the scene in SULLY where Tom Hanks jogs through Times Square, we noticed that some of the bright neon signs were getting blown out on the Sonys. We dialed back the HDR contrast setting to bring out the detail in bright areas of the picture, but this did "flatten out" the image somewhat (obviously decreasing overall brightness and "pop" as a result). In fairness, though, the Times Square scene in SULLY is a true torture test for this kind of thing, and this is one of the areas where projector compromises often need to be made, as projection systems are not inclined to handle specular highlights as well as something like a Z series Sony or OLED.
IMO, the RS4500 was the overall "winner," but I'd be curious to hear other's thoughts. And I will repeat what I said in my previous review - I can't imagine anyone going wrong with any of these projectors.