I am only comparing the reactions to a Luiz and an Ivanovic's fault , i remember Luiz being slaughtered when he lost possession with 3 players behind him because that resulted in a goal but with Ivanovic or Cahill it's "uncharacteristic" so no problem !! I don't want to get into the discussion of who's better , but Luiz is twice the defender Ivanovic or Cahill will ever be in terms of awareness , reading the game , tackling and abilities , his main problem is that in England , if you are a defender , you better be the typical big , tall , strong defender who will just baloon the ball into the stands if it ever comes near his penalty box , and all you have to do when in possession is pass the ball to the nearest midfielder other wise you are being too casual and not stress free to watch!