Maybe it is because I am an engineer, but tbh, I think there are more important issues. Don't get me wrong, raising living standard is very important, but I don't consider lifting people out of poverty and income equality to be the same issue. The former is a necessity because you need an educated work force for farther development and people in poverty doesn't tend to get a good education.
Income disparity, on the other hand, is a much more complex issue. While too much disparity is certainly bad for the society, it is also unrealisitc to expect everyone to make the same amount of money. Even for the same position, the lazy and the hardworking should have a difference. There is also the problem of people's personal expectation vs what is actual best for the nation.
Of course, the other part of the income disparity is region development disparity, but such development takes time and also, let's be honest, the average joe on the street cares more about how much money he is making than how the country is investing in regional development. (which is one of the reason you should let a professional doing his job rather than rely on your personal feelings)
As for the most pressing issue, I am a firm believer that improvement in the overall productive forces is the most important driving force of social advancement. In this sense, my take on the most important issue for China will be technological innovation, infrastructure improvement, space exploration, etc.