Yak - The ISTAR capes of the F-35 are routinely oversold. Sensors comprise a Sniper equivalent, very low-rez all-round video, decent ESM and a radar that can't be used very much without compromising stealth, but has a SAR mode. (Spot rather than area, though.) Not much persistence in the platform. The real problem is the lack of a high-rate datalink off the platform - only non-stealthy Link 16.