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1) Faster color wheels (with same segment size) produce less brightness, not more. The reason is because the synchronization time of each RGB color has to be quicker and you lose more light as an absorption ratio in the light path and lens. That is why they put slower color wheels on the light canon projectors.
2) As far as 6x color wheel speed, on my Benq w7000 the CW speed is actually 4x in all modes except 1 mode (I think dynamic). I believe dynamic has a true 6x @ 60hz only on the w7000.
Edit: 4x at 60Hz means 4x color wheel, we don't care about 50hz...
Also, the Benq's do well as far as lack of RBE at 4x, I've seen some PJ's with 4x color wheels still produce too much RBE, due to higher contrast and different segement setup I assume.
3) I haven't seen any budget DLP that sticks out as "exceptionally better", better yes, but not sure about exceptionaly. Now maybe so if we are comparing to specific models that have issues, but perhaps the Optoma gt1080 is very lacking. I own the Benq w7000 (which is the big brother to the w1070). I guess the differences are in the eye of the beholder. Now, if we are talking about a Mits hc4000,hc7900,hc8000, or a Sharp xvz-30000; then I agree there are some exceptional differences. The Benq's are pretty sharp if you sit close, but they are not as sharp as the hc7900 or hc8000 (the two sharpest sub-$3500 PJ's ever made IMO).
4) I think as far as color goes, it depends on your calibration skills. Projectors like Optoma GT1080's have gamut issues, so the way to improve the picture even more would be to use MadVR and a calibration meter. You can also fight it without MadVR, but the calibration controls are more limited. The real reason the color is so off isn't just because of the inferior color wheel, it's Optoma's lackluster CMS and calibration setup. I've seen a few projectors with very non-standard color wheels that can still do a great job on color.
I still think you are doing partly a sideways upgrade, an upgrade none-the-less, but I wouldn't call it a major upgrade. Not like the difference between going from a $500 DLP to a JVC or something.
That said, as noted the main reason most people have issues with the Optoma's is because they are hard to calibrate.
Last edited by coderguy; 04-13-2017 at 12:02 PM.