Don't forget pricing for System Center 2012
I have seen beautifully detailed comparisons for vSphere 5.1 vs. Hyper-V 2012 that compare features in vSphere 5.1 with those enclosed in System Center 2012 but somehow forget to include the cost of System Center 2012 when it comes down to comparing apples to apples. Without SC 2012, you need to be a PowerShell wizard and rely on your scripting. I applaud Microsoft for forcing VMware to included shared-nothing live migration with ESX 5.1, but you must include the cost of SC 2012 in any sane comparison.