The article fails to mention one important element: management. VMware's Virtual Center Server is a relatively cheap investment, with most of the cost being in the hypervisor licenses, so any serious business will buy Virtual Center. With Microsoft, by contrast, serious management is done through System Center 2012 Virtual Machine Manager. Anyone who has ever tried to license SCOM knows that SCOM licensing makes Windows licensing look sane and approachable. Nor is it cheap. In theory, Hyper-V is free, but if you want the enterprise-level features offered by VMware, you'll pay heavily for it.
Furthermore, if you want service and support, you will then pay even more for a Microsoft (or, more likely, a reseller) support contract and then pay even more for Software Assurance. I have not crunched the numbers, but it's simply unbelievable that Hyper-V offers a reasonable TCO on a feature-by-feature comparison.