The parity principle requires only a 'marked' disparity giving rise to a justifiable sense of grievance — the disparity need not be 'gross' or 'glaring' — and the fact that co-offenders were sentenced by the same judge does not relieve an appellate court from analysing whether the proportion between sentences leaves the applicant with a justifiable sense of grievance, particularly where co-offenders were sentenced at different times on different bodies of evidence.
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