Reader Joseph Luk has produced a comparison page between these two Canon cameras.

I received this email from Joseph:

Hi, Perhaps your readers may be interested in the following:

http://insci14.ucsd.edu/~joluk/powershot/

I took an A5 Zoom and brand-new A50 and put them head-to-head. Any feedback you have would be appreciated -- I really respect your work.

Cheers, Joe

Thanks Joe! And thanks for the great comparison, anyone considering either of these two cameras should check out Joe's page.