I think that there is "sharp" and then there is "razor sharp". For most folks, the JVC will be "sharp enough". The other capabilities of the JVC will more than compensate for any minor issues with sharpness.
For me, sharpness is king, especially for the best live HDTV. It is the difference between the "open window" and almost open window.
This is not a criticism of the JVC. That it is not the sharpest PJ out there is pretty much a fact. It simply doesn't matter to most PJ buyers.
Receiver: Yamaha RX-A850
Projector: JVC DLA-X550R
Display: Panasonic TC-P55ST30
Sources: Oppo BDP-103; Cisco CHS 435HDC (FIOS); Roku 4