Yes, i just re-did same tests at 3000m, 400 and 450km/h IAS. Results were around 5 sec, without using rudder at all (to compare my previous test). I guess it's very close to real one, finnish test for G2 says 4-5 seconds. :thumbup:   
Anyway, after couple hours of flying, stick forces doesen't feel excessive at all anymore.  I just needed to get used to them.    
Flying the K4 is now better than ever.