Here is the link to Sean Rehaag's latest research paper on this issue: http://ssrn.com/abstract=2027517
He sets out statistics on grant rates for each Federal Court judge (at the leave and merits stages) from 2005 to 2010. There is a large variability in grant rates across judges. For example, Justice Campbell granted leave in around 78% of the 238 perfected applications he decided, whereas Justice Crampton granted leave in around 1% of the 221 perfected applications he decided.
The abstract for the paper reads:
This working paper offers an empirical examination of judicial review in Canada's Federal Court in the refugee law context. Drawing on a dataset of over 23,000 applications for judicial review of refugee determinations from 2005 to 2010, the paper examines whether outcomes in these life-and-death applications turn on their merits, or whether, instead, they hinge on which judge is assigned to decide the application. The paper reveals that outcomes over the past five years frequently came down to the luck of the draw, with, for example, one judge more than 50 times as likely to grant applications than another judge. Based on these findings, the author offers several recommendations for reform to enhance fairness and consistency in this important area of law.