According to ESG research, 75% of organizations use public cloud services of one kind or another today (note: I am an ESG employee). A majority (65%) use SaaS, 38% use IaaS, and 33% use PaaS.
In terms of IaaS, Amazon Web Services (AWS) is still the king of the hill, but many large enterprises are implementing or kicking the tires on alternatives. Microsoft is pushing clients with enterprise client access licenses (ECAL) toward Office365 and Azure, IBM is winning SoftLayer deals with large customers, and Google Cloud Platform is gaining traction in the life sciences industry.
