The review on the new XA50 and XA40 are limited at this point. But based on specs alone I think XF400 will still make a better video camera despite its been in the market for almost 2 years. Do you have any experience shooting with XF400?
There are a few options to choose from. The closest equivalents are the NX80, Z90 and the AX700 with XLR-K2M. The new MC88 is a budget HD model of the NX80. You can get 7 hours out of 1 Sony battery (HD mode) vs 2 hours from Canon
In terms of ergonomics, Canon has a leg up with its touchscreen menu and focusing aid. Sony's model are notoriously finicky and uses older resistive touchscreen compared to Canon's capacitive ones. The Sony touchscreen is restricted to only focus selection while menus have to navigated with a joystick selector located on the opposite side of the OK button - making navigation a two-handed affair.