Samuli - I know someone who MAY be selling a 180/4 in the near/intermediate future. I'll let them know you're interested and if they decide to pull the trigger they can decide if they want to hook up (as it were).
Henrik - given the gorgeous subject matter of your 135mm shot, if you've traded up (or hell even laterally) from your (as you put it) "ex,ex, ex..", you must be one VERY, VERY happy man.