* Fast Retailing soars 8 pct, sees record full-yr profit * Sony extends loss after poor reception to turnaround plan * China Q1 GDP grew 8.1 pct, below 8.3 pct forecast * Megabanks outperform, Goldman hikes target prices By Mari Saito TOKYO, April 13 (Reuters) - Japan's Nikkei share average rose 1.2 percent on Friday, propped up by a rally in Fast Retailing and relief that North Korea's rocket launch ended in failure, but weaker-than-expected growth figures from China weighed on the upside. China's annual economic growth slowed to 8.1 percent in the first quarter from 8.9 percent in the last three months of 2011.