I mount 18' from screen, with sitting distance ~ 14'. PJ is distant enough that I don't notice it, and HP geometry still provides good gain. HP design is amazing, easily the biggest gain for $$$, pun intended ): Many have stated its max gain is actually closer to 3.0. I do have absolute light control and specially designed room. However I can easily watch sports with side lights on even in low lamp mode - and that's in video calibrated mode.
I suggest you play with HP calculator on a spreadsheet - you can optimize your set up to your liking. I did, and the results are outstanding. I can only imagine what it would look like on the JVC or the Sony with 2-3x the lumen to play with.
By the way, custom installers must hate HP screens, but so what! Plenty of other sheep in the woods ):