with pleasure 与 it is my pleasure 的区别

意思没有太大区别,只是with pleasure是省略句,后者是完整句.
例如：
Can you do me a favor?你能帮我个忙吗?
（I can do you a favor）with pleasure.我很荣幸（能帮助你）.
It is my pleasure.这是我的荣幸.