The highest resolution of the Panasonic PT-EZ590 is WUXGA (1920x1200). That's over two times the resolution of a WXGA (1280x800) projector, which is the most frequently found resolution.
This projector's resolution (WUXGA (1920x1200)) is actually the best resolution across all recently released multimedia projectors.
Across similar types of projector the worst resolution is XGA (1024x768).
Other data projectors that have a resolution of WUXGA (1920x1200) currently available that you might want to consider include the Panasonic PT-FZ570 (£1,935.12) which is cheaper.