The highest resolution of the D7180HD is 1080p (1920x1080). That's over two times the resolution of the most common native projector resolution of WXGA (1280x800). The best resolution of all projectors of a similar spec and age to the D7180HD is DCI 4K (4096 x 2160) and the worst is nHD (640x360).
Alternative projectors that have a resolution of 1080p (1920x1080) currently available that you might want to consider include the Acer P7505 (£1,434.97), or the Infocus IN5316HDA (£1,692.02) which is cheaper; or the Benq SH915 (£1,341.88) which has a better Rating.
If the resolution of this data projector is too low for you then you might also want to look at the Acer P7605 (£1,730.87) (WUXGA (1920x1200 and cheaper) and cheaper), or the Hitachi CP-WU8440 (£1,088.18) (WUXGA (1920x1200 and cheaper) and cheaper) or the Epson 1980WU (WUXGA (1920x1200 and higher rated) and higher rated).