Arrow, I just wanted to take a minute and thank you in advance for taking the time and making the effort to do this comparison. These would be great low cost alternatives to Lcos lasers: DLP precision without the detriment of lamps...no worries about lamp explosions (however unlikely), effect of lamp strikes, short-term repeat calibrations, bulb dimming after only a few thousand hours, the hassles of changing bulbs, and their replacement costs.
As you know, I had the predecessor model to the HT9060, the HT9050, which has the same LED HLD platform.
I wouldn't consider the HT9050 to be a business class projector by any means. I had one for a short time and the glass and processor in it were fantastic. Where I will be looking when you review, will be at any contrast improvements over the last model. I had Smarteco/latest firmware for the 9050 but I couldn't get it to do an on/off contrast ratio much over 924:1. That machine didn't have HDR and was unable to apply its DCI P3 color ability due to lacking BT2020 compatibility either. By the way, the 9050 Kris reviewed had firmware added and was able to reach, he reported, a dynamic contrast ratio of about 4,000:1.
So, hopefully, this new HT9060 will improve on all fronts. But, again, my focus will be to see if BenQ made any headway in the contrast/dynamic dimming department. I'm not expecting miracles, but for all else the 9050 did so, so well, even 4K to 8K:1 would be a revelation for me.
I find that light/dark object separation has a bit of pop on single-chip DLPs due to their precise lines.
As for the LK990, I believe these were designed as part of BenQ's Pro AV line. What concerns me is potential for RBE and how easy or difficult the laser's color can be calibrated for BT709 and how far out it can go toward P3. I would have to demo one, I suppose...because I had the UHZ65 for mixed use. While the dynamic contrast on UHZ was excellent, well over 35,000:1 and not even in its most aggressive dimming modes, the RBE on it was ubiquitous.