The Sony VPL-GTZ1 has a maximum resolution of DCI 4K (4096 x 2160). That's over eight times the resolution of the most common native projector resolution of WXGA (1280x800).
This projector's resolution (DCI 4K (4096 x 2160)) is in fact the best resolution across all similar spec data projectors that have been on the market for a comparable time to the VPL-GTZ1.
A WVGA (854x480) native projector resolution is the worst resolution amongst similar types of projector.
We compared this multimedia projector to all the other projectors that have a resolution of DCI 4K (4096 x 2160) and we think the Sony SRX-T423 which have a better Kagoo Rating™ are also worth considering.