CMS - Alfresco, Magnolia, Drupal and Joomla Comparison

Question

I am comparing Alfresco, Magnolia & Joomla especially specific to following features:

a.  Ease of Integration of user created templates.  
b.  JCR (JSR-170?) or CMIS compliance.   
c.  Scalability in architecture.   
d.  Mobile site deployment.   

I used cmsmatrix.org to compare features but I could not get some of the specific information related to above mentioned points.

Any insights based on your experience on working with one or more of the above CMS products will be helpful.

Thanks,
Krish.