The Sony VPL-DX220 has a maximum resolution of XGA (1024x768). That's 62% less resolution than a 1080p (1920x1080) projector, which is the most common resolution. The resolution of all new similar spec multimedia projectors ranges from SVGA (800x600) to DCI 4K (4096 x 2160).
There are a number of alternative multimedia projectors that have a resolution of XGA (1024x768) currently available that you might want to consider including the Hitachi CP-DX301 ($399.00), or the Benq MX528 ($399.00) which is cheaper.
If you are looking for a data projector with a higher resolution then you might want to look at the LG PH550 ($549.99) (720p (1280x720)) which also has a higher rating.