London - Winston Churchill, who outdid Adolf Hitler both on and off the canvas, was celebrated yesterday with the largest exhibition of the former British leader's paintings ever staged. The show has prompted a rethink among some critics, with one concluding that "he really was an artist". Both Churchill and Hitler were both keen painters. The difference was that Hitler, thwarted as an artist, went into politics while Churchill, triumphant in war, turned to painting to relax.