I'm not sure its best for me to consider calibrated brightness. I've never had a tv calibrated and honestly i'm kind of doubtful i would have my PJ. Not that i wouldn't consider it though, i guess. Honestly i am not a critical viewer for color accuracy. I prefer poppier color that jumps out at you even if its not accurate. For higher end TVs i prefer samsung colors over sony.That is not correct at all. Calibrated to a de of 3 or less, there is not a huge difference in brightness between these two. The Epson is brighter in all cases except if you engage the DCI P3 filter on the Epson for HDR. With Filter the Epson loses 40% to 50% of its brightness. In a blacked out room, the JVC is clearly the better projector as long as it is bright enough to light up the screen, but that applies to any projector. Also keep in mind, with the Epson you need more brightness for HDR than what you need with the JVC, due to the JVC having dynamic tone mapping.
The dynamic tone mapping for HDR, way better blacks and contrast are huge deals to me. Bigger than brightness for ambient light viewing? Maybe not....TBD. Wish i could have both.