A sharp image has long been a strong point of Optoma projectors. The HD806 projector, which shares the same optics as other Optoma 1080p projectors, is definitely very sharp.
I found the default sharpness setting (7) to oversharpen, leaving the usual ghosts along bright lines against dark or vice versa. I liked the projector better with sharpness reduced to 3, maybe 4 on the menus.
The Optoma's sharpness gives the projected image a lot of depth, especially digital source material, be it a high def sporting event, or your favorite HDTV informational channel content, including Discovery HD, History Channel (HD), and so on. I've got the Giants vs. Cowboys Sunday night game on now, while writing, and it looks really crisp and clear. I know that neither my JVC RS1, or Epson Home Cinema 1080 UB is quite as sharp, not that I complain about either.
Top left: Optoma HD806, Top Center, Sanyo PLV-Z3000, Top right: Mitsubishi HC6500
2nd row left: Panasonic PT-AE3000, middle: Sanyo PLV-Z700, right: InFocus IN82