Ubuntu leading with KVM, really ?
"We adopted KVM earlier than anyone else, and we are quite pleased with its momentum," says Zimmerman
That's just not the case. Fedora shipped KVM well before Ubuntu.
Then there's the matter of actual development.
How much work as Canonical done on KVM? I'll give you a clue, you can count the contributions one one hand and still have fingers spare?
Red Hat was contributing to KVM from the first days of KVM, long before the acquisition.