A 4K projector projects images that are 4 times sharper than Full HD projections. The projection of a 4K projector is more detailed, so the image looks more realistic. Make sure to determine where you want to place your projector. That's because there are 4K projectors with (ultra) short throw and normal throw. You can place (ultra) short throw projectors close to the screen or wall. Normal throw projectors have to be placed a bit further away. Keep in mind that using certain functions affect the sharpness. For example, the keystone correction is a feature to correct the projection shape, but it also makes the image more grainy.