Is this report reliable ?
أكمل المؤمنين إيمانا وأفضل المؤمنين إيمانا أحسنهم خلقا
The most complete of believers and the best of believers are those with the best character (Musannaf)
This Hadith has been recorded in numerous Hadith collections with similar wordings, other than the source you have cited. Imams Tirmidhi, Ibn Hibban and Hakim (rahimahumullah) have declared the Hadith as authentic (sahih).
(Sunan Tirmidhi, Hadith: 1162, Sahih Ibn Hibban; Al Ihsan, Hadith: 479 and Mustadrak Hakim, vol. 1 pg. 3)
And Allah Ta’ala Knows best
Answered by: Moulana Suhail Motala
Approved by: Moulana Muhammad Abasoomar
Checked by: Moulana Haroon Abasoomar