Don't know much about GKK, but do know a little about SFI. SFI has not defaulted on any loan and has held out until recently for selling assets waiting to get a better price. They have continued to buy back common shares through the "bad" times though at a slower pace.(currently about a million a month)
Price of the SFI preferred shares has recently been going up while the common has been going down. Makes no sense, except that the common are shorted (currently 25% short interest) and the preferred are not. At some point we will find out who is right the preferred investor or the common short.