Main differences bwteen the Credo and IQ1/2 series are:
Different industrial design
Different UI
Leaf Profiles and Curves
Extended Touch Area
No Mechanical Buttons
No Sensor+
No Focus Mask
No Auto-Horizon or Auto-Keystone
No Wireless Preview Option to Ipad (IQ2)
Credo is available in Hy6/AFi mount
Different Warranty Options
Different service/support channel
Made in Israel rather than Denmark
Price
More detailed information can be found
hereLance