If the sole reason you're looking at a K instead of a C is the export sight, I'd say you'd be best off to actually look through it first.
While I'm basing this on the CA export sight, I imagine the SRC one is pretty similar. Basically:
-Lense is crystal clear (yay!)
-Terrible eye relief (boo!)
-Carry handle is nice to have (yay!)
-Extremly limited field of view (boo!)
"Someone in a Prius tried to race me at a stop sign the other day. I couldn't believe it. I had him for the first 100 feet or so but I can only walk so fast."