Tā yǐjīng hěn yōuxiù le, zhège jiǎngxiàng duì tā láishuō zhēnshì jǐnshàng-tiānhuā.
He was already excellent - this award is just icing on the cake for him.
Tips
usage
锦上添花 (icing on the cake) describes a bonus added to something already good. Its counterpart is 雪中送炭 (send charcoal in the snow), which means to help someone in genuine need. The two idioms are often contrasted.
