R. v. Lu, 2013 ONCA 324 holds:
 Before dealing with these submissions, it is important to recall the role of an appellate court when reviewing a sentencing decision. Appellate courts are to grant sentencing judges considerable deference when reviewing the fitness of a sentence. They are to interfere only where the sentence is demonstrably unfit, or where it reflects an error in principle, the failure to consider a relevant factor or the over-emphasis of a relevant factor. An appellate court cannot interfere with the sentence simply because it would have weighed the relevant factors differently. See R. v. Nasogaluak, 2010 SCC 6,  1 S.C.R. 206, at para. 46.