an outstanding person among mediocrity ? 卿所謂～，庸中佼佼者也。(《后漢書·劉盆子傳》) You should be regarded as an outstanding person among mediocrity and a giant among dwarfs.
鐵中錚錚tie zhong zheng zheng
person of true caliber
鐵中錚錚tiě zhōnɡ zhēnɡ zhēnɡ
錚錚：金屬撞擊所發(fā)出的響亮聲音。比喻出類拔萃的人物或事物。distinguished among men, an outstanding person among mediocre people