For picture quality, the w1070 has a lot of major qualities that are absolutely top-notch that can't really be improved upon..so the w1070 will definitely match or beat the Sony for; brightness, color accuracy (even right out of the box, likely), 3D performance, input lag, fast-motion resolution, and lamp life.
They should both have very good/clear focus with the Sony having a more expensive lens while the w1070 has the singlechipDLP advantage of perfect alignment.
The Sony will have more placement options with its flexible lens-shift and zoom, while the w1070 will need to be placed a few inches above (or below) the screen and roughly one foot back for every 10inches of screen diagonal.
The Sony could easily have a contrast advantage, but the w1070 performs very well for its price. I'd expect the Sony to have darker blacks..noticeably, but not fully mind-blowing. That'll be the only real image difference to expect the Sony to have any advantage.
The Sony is almost definitely the quieter projector when running as well, the newer ones can be practically silent.