母親(ははおや)の友達(ともだち)の息子(むすこ)さんは、弁護士(べんごし)として立派(りっぱ)に働(はたら)いているのにひきかえ、僕(ぼく)は・・・(まだフリーターだ)。
In stark contrast to my mother's friend's son, who is working prominently as a lawyer, I am… (still a permanent part-timer.)
Notice that since one side of the comparison is evaluated positively, and the other negatively, the comment/description can be omitted and the reader/interlocutor will get the intended meaning from the context