The highest resolution of the Benq SX920 DLP XGA is XGA (1024x768). That's 62% less resolution than the most frequently found native projector resolution of 1080p (1920x1080). The resolution of all comparable spec multimedia projectors that have been on the market for around the same time as the SX920 DLP XGA ranges from SVGA (800x600) to DCI 4K (4096 x 2160).
We think you might also be interested in some of the alternative projectors that have a resolution of XGA (1024x768) currently available including the X319USTir (£968.45), or the X319UST (£802.78) both from Optoma which is cheaper.
Projectors with a higher resolution that might be worth considering include the Sony VPL-SW631 (£918.99) (WXGA (1280x800 and cheaper) and cheaper), or the Optoma W319USTi (£1,035.90) (WXGA (1280x800 and cheaper) and cheaper).