Hadith.899 - Imam (as) said:
"Pray the Jumu'ah (Jumu’ah prayer) with the adhan of these people, for they are the most diligent in observing the time."
[AL SADUQ]
There should be a sitting between the adhan and iqamah, except for Maghrib, where it suffices to have only a breath's interval between the adhan and iqamah.