I didn't respond to this because I have not seen the X1 yet. I am very familiar to the LT 150 however.
Resolution is one of the parameters affecting PQ. It is possible that the superior video processing, contrast and color of the X1 (if we are to believe reports) could more than compensate for the fact that the X1 is only SVGA while the LT150 is XGA.
The LT150 has good contrast for its generation but does not have very good video processing, especially on S-video and interlaced component inputs. Infocus has always been excellent on video processing (going back several years), and the X1 has the Faroudja chip.
While we will have to see, my bet is that, viewed at a distance of 1.5-2 screen widths, the Infocus X1 will outperform the LP150 many kinds of inputs.