This is to show the result of Canon PhotoStitch attempting to stitch 4 photos in a 2x2 matrix arrangment when left to it's own devices. Notice the bad alignment at the top centre of the building and on the fourth floor from the top, right side? In fact all the joins are pretty noticeable. The manual method gives much better results. I was also 2 zoom steps in (eqivalent to 50mm in a 35mm format).