The global shutter means no rolling shutter. The entire frame is scanned at once (i.e., not top to bottom with some lag from the top to the bottom, where the scan itself captures motion over a very brief time period). You don't get that stair-stepped jagged appearance with motion, but rather clean motion blur within the frame. If you leave the shutter speed at a typical video rate (say, 1/50th) the individual frames may not be ideal for photos from video, but will look much better as video. If you crank up the shutter speed with a global shutter the individual frames will certainly look better than with a rolling readout (but worse as video -- more inter-frame jitter).