Made the upgrade to RS15 from RS1 last Friday. Spent time setting up over weekend. Jason did a great job of calibration. I don't have any instruments to measure anything
so my comments are based on visual appearances in comparison with the RS1, and after only a couple of hours viewing. I am very pleased with the image. As others have said, it has better blacks, sharper, and looks like better contrast. The iris is at position 3 so it's not overwhelmingly bright.
I sent my Lumagen HDP to Jason to calibrate it with the RS15 but we had a mixup with the power cord and he didn't get to calibrate the HDP also. I would have liked to have seen what that would have done. As it is I am using the gamut adjustments that Lawguy, Ronomy and others (Thank you very much!) suggested over a year ago. I haven't tried the RS15 without the Lumagen yet, but very impressed with the naturalness of the colors using those adjustments (granted, I believe a CMS could do better). I know it's early but has anyone tried adjusting the gamut on HDP/Q with the 15 yet? I wonder if the settings would be much different.
Here's a question. I have the 15 mounted upright on a shelf suspended about 12-15" from ceiling, 16 feet back from 120" diag 2.35 Carada BW screen, using Panamorph CIH lens. I had to make substantial (it seemed) vertical adjustment. Has anyone measured any significant loss of picture quality with large vertical adjustment? When I have time I may try flipping it but then I might have to do some shimming to get image centered as the 15 does not have a perfectly flat top with adjustable projector feet!
It will probably take a few weeks to get a full feel for the picture in different movies/settings. By the way, watched Sunday football and MLDS and picture looked fantastic from DISH! So right now I am very happy with the upgrade and don't want to hear about any great new projectors for a while!