Somehow, I have a feeling that the Xbox One is one monster machine at efficiency.
Well I have heard of things like "it's a MONSTER when it comes to fill rate" but efficiency as a spec is kind of boring On the other hand it seems to be what MS is trying to accomplish, utilizing existing resources efficiently ( at least with directx code ). A worthy goal ( XB1 in general will only be crunching directx code )
Panello claims that they won't give "30%" to the competition and I am not to sure where he gets that number ( didn't digital foundry say it was more like 20% ? ). In any case I think we can translate to say that with little in the way of optimization for each console the XB1 will be closer than 30%. A reasonable claim based on what we know I guess. We don't know all the things that the NON-XB1 ( don't want to even JOKE about making a comparison post ) does to boost efficiency let alone what will be done with the extra resources available to it.
Being "more efficient" does give you the benefit of good performance early on rather than waiting for a dev to work out how to use "extra resources" and I am sure that tailoring their tool kit to the tool itself to maximize the performance early on in this console cycle is something that MS is working hard to do. I am also assuming that MS expects that the XB1 would the multi-platform target although that can be debated and maybe a bit of a fly in the ointment.