The highest resolution of the Benq MW721 is WXGA (1280x800). That's 30% more resolution than the most common native projector resolution of XGA (1024x768).
This projector's resolution (WXGA (1280x800)) is in fact the best resolution across all 13000:1 contrast ratio multimedia projectors that were released around the same time as the MW721.
Across similar types of projector the worst resolution is SVGA (800x600).
It may also be worth considering one of the alternative projectors that have a resolution of WXGA (1280x800) currently available including because of it's better review score, the MW663, the MW843 ($1,198.99), or the MW523 ($1,142.43) all from Benq.