The highest resolution of the VPLFH31 is WUXGA (1920x1200). That's over two times the resolution of the most frequently found native projector resolution of XGA (1024x768).
A WUXGA (1920x1200) native projector resolution is in fact the best resolution across all multimedia projectors of a comparable spec and age to the VPLFH31.
Across comparable types of multimedia projector the worst resolution is XGA (1024x768).
It may also be worth also looking at one of the other multimedia projectors that have a resolution of WUXGA (1920x1200) currently available including because of it's better review score, the Canon WUX-450[plb_2199632_price].