زیدٌ كالأسد
Zayd is like a lion.
زیدٌ أسدٌ
Zayd is a lion.
The first wording expressly states a comparison through “ka-.” The second omits that particle and presents the lion-like quality as more closely joined to Zayd. Omission does not, however, guarantee that a simile is better in every context.
Emphatic versus explicit concerns the particle. Eloquent, familiar, remote, condensed, and detailed examine other aspects. Their criteria should not be conflated.