The EB-G6450WU has a maximum resolution of WUXGA (1920x1200). That's over two times the resolution of a WXGA (1280x800) data projector, which is the most common resolution.
A WUXGA (1920x1200) native projector resolution is actually the best resolution amongst all data projectors of a similar spec and age to the EB-G6450WU.
Amongst comparable types of projector the worst resolution is XGA (1024x768).
It may also be worth considering one of the alternative projectors that have a resolution of WUXGA (1920x1200) currently available including the Optoma EH7700 (£11,998.80), or the Panasonic PT-EZ770 (£4,239.60) which is cheaper.