Here is an excerpt from an abstract that may meet your needs for a comparison of cloud service performance.
Performance and Cost Assessment of Cloud Services: “Using a suite of cloud testing applications we conducted in-depth empirical evaluations of a variety of real cloud infrastructures, including Google App Engine, Amazon EC2 and Microsoft Azure. The insights from these experimental evaluations, and other public/published data, were combined with the modeling technology to predict the resource requirements in terms of cost, application performance, and limitations of a realistic application for different deployment scenarios”.
The following IEEE links are related to this topic: Performance Evaluation of Cloud Computing Offerings - http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5359493&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D5359493
SMICloud: A Framework for Comparing and Ranking Cloud Services - http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6123500&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6123500
Performance and Cost Assessment of Cloud Services - http://link.springer.com/chapter/10.1007%2F978-3-642-19394-1_5?LI=true