D-Wave's computer is fundamentally different than other quantum computers. The D-Wave is a quantum annealling computer. And for a while, there was some question whether what it was doing could actually be described fully classically, though now I think the consensus is that there is some quantum effect. Although classical or quantum, there could still be a practical speed up over the typical conventional computers. The idea is to use them for optimization problems. But they aren't a straightforward mapping to the usual quantum computer, and so cannot be directly compared.

To me, it's like comparing an analogue and a digital computer.