The Benq MX722 supports a maximum resolution of 1600 x 1200 (UXGA). That's over six times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by comparable spec data projectors that are a similar age to the MX722. Across all data projectors of a similar type and age to the MX722 the best resolution is 4096 x 2160 and the worst is 640 x 400.
It may also be worth considering one of the alternative multimedia projectors that support a resolution of 1600 x 1200 (UXGA)|640 x 480 (VGA) currently available including cheaper projectors such as the Benq MH740 (£644.04).
If the resolution of this 5300:1 contrast ratio data projector is not high enough for you then you might also want to look at the Panasonic PT-VX42 (720 x 480|720 x 576|832 x 624|1152 x 870|1024 x 768 (XGA and cheaper)|1280 x 1024 (SXGA and cheaper)|1280 x 720 (HD 720 and cheaper)|1440 x 900 (WXGA+ and cheaper)|1600 x 1200 (UXGA and cheaper)|1920 x 1080 (HD 1080 and cheaper)|640 x 480 (VGA and cheaper)|800 x 600 (SVGA and cheaper) and cheaper).