Agree'd, spec for spec its completely different. The fact its the GPU and CPU on the same board means instant response times between both. Plus "top of the range" GPU's for PC are around £700-800 alone. So that's never going to happen.

However, even though its not a big step it'll be what the devs can do with it once its been available for a while.

Look at this example.

Two games made by the same developer for the same console.