We tested with virtio too (we didn't realize Qemu didn't use it by default!) and while Qemu performance was little better, tools/kvm still beat it with fair margin. Unfortunately I posted the non-virtio results.
That said, don't read too much into the results. It's *one benchmark* on *one machine*. If you care about performance, you'd better benchmark things yourself. The point of publishing the results is just to show that there's some real potential in tools/kvm and that Qemu probably should improve their default configuration.