Hong Kong's Hang Seng index slightly advanced on Friday lifted by overall global optimism as German business confidence surged and US jobless claims stayed steady. Hang Seng index gained 0.12% or 25.87 points and finished at 21,406.86. HSBC Holdings added 0.4% as experts predicted the company may report a 24% gain in its annual earnings next week. Gains were limited by property shares as Sino Land dropped 1.1% and Hang Lung Properties gave up 1%.