The Predator can also carry a SAR; either the original Westinghouse model or the upgraded Northrop Grumman TESAR. Both give a resolution of around 1 ft and possible future upgrades include the excellent Lynx SAR; probably fitted to the bigger MQ-9 though. However, one of the main problems is that even high-quality radar imagery is harder to 'read' and is confined to still images only. Most of demand for Predator is focused (no pun intended) on its Full-Motion-Video capability.
ASTOR's MTI capability will be excellent but don't get too hung up on the general war scenario; it's imaging capabilities will also be a quantum leap forwards for the RAF and Army.
SBG