"The true position in my opinion may be briefly stated as follows. It is obviously desirable that persons who have been parties to the commission of the same offence should, if other things are equal, receive the same sentence, but other things are not always equal, and such matters as the age, background, previous criminal history and general character of the offender, and the part which he or she played in the commission of the offence, have to be taken into account. The fact that one co-offender has received a sentence which is more severe than that imposed on a co-offender whose circumstances are comparable would provide no reason in logic for reducing the former sentence, if the only question were whether that sentence, viewed in isolation, was manifestly excessive. However, the Court of Criminal Appeal in Queensland, on an appeal against a sentence, may quash the sentence imposed and substitute another 'if it is of opinion that some other sentence, whether more or less severe, is warranted in law and should have been passed': s 668E of the Criminal Code (Q). The same or similar words appear in the statutes of the other Australian States, and they are wide enough to empower the court in its discretion to reduce a sentence not in itself manifestly excessive in order to avoid a marked disparity with a sentence imposed on a co-offender. It may be said that the very existence of a disparity reveals that an error must have been committed, but I would prefer frankly to acknowledge that the reason why the court interferes in such a case is that it considers that the disparity is such as to give rise to a justifiable sense of grievance, or in other words to give the appearance that justice has not been done. The decision whether the existence of a disparity calls for intervention is a matter which lies very much within the discretion of the Court of Criminal Appeal."