very big difference if you transfer the money to your account in China. I learned from BK. A lot of toptic is about how to do it, u do not need to go to China. Just open account in HK.
I did not 在HSBC transfer 50萬人民幣 to other bank. I use cheque. I just deposite a 60萬 hk doller $ cheque to wing hang bank account. Then change to 人民幣 everyday rmb$20000. take 25 days to tranfer all to 人民幣 china account.