When comparing, look at the detail in the roof (tiles), and also in the assorted trees and plants. The small images below (all from the same projector) show a slightly overexposed scene.
On the left, is the HD700, the middle, the Epson 8500UB/9500UB, and on the right, the Panasonic PT-AE4000. The exposures are all a little different, but you should be able to appreciate the combination of shadow detail and dark blacks
Click on the images and you will find larger images, but of the different projectors. The large images are far more overexposed, to allow a closer inspection of shadow details. Note, it's not about how bright the roof tiles are, but that they are visible, and that there are also differences in the trees and shrubs.