Sharpness is impressive. Though not the sharpest projector around, it definitely fits into what I call "sharper still". I generally break down 1080p projectors as either average sharpness, or "sharper still". 1080p source material that is all digital looks really sharp (as a JVC owner, I'm a little jealous), even though the difference is hardly great.
Of particular note, on the close up, of the monitor image (from Space Cowboys) below, I could read the smaller type on the screen as well as on any other projector. That's probably a tribute to the sharpness not being "oversharpend" to the point, where it hurts, rather than helps, on really small objects.
Score the Vivitek H9080FD as extremely good when it comes to sharpness!
For your consideration, our usual close up images
Top left: Vivitek H9080FD, Top Left Center - Sanyo PLV-Z3000, Top Right Center - Sony VPL-VW70, Top right - Mitsubishi HC7000
2nd row left: Epson Home Cinema 6500UB, left center: Panasonic PT-AE3000, right center: Optoma HD8000, right: InFocus IN83