For video editing, I'd lean toward the Vaio S 13.3 since it has a full mobile CPU. The Vaio Z can do the job wonderfully, if you can live with the price. The UX32VD runs on a ULV CPU and that does mean slower video processing, and the GT620M isn't the sharpest graphics card. If you watch our gaming video posted in the news section, you'll see that more demanding games need to be run a lower than native resolution with effects set to low. The Vaio S 13.3 with the NVidia GT640M LE plays games at 1080p like a champ.
-------------------- Lisa Gade Editor in Chief, MobileTechReview