Battery life say that for a same amount of work MTL used in average 11W while HPoint used 7.7W, this is due to the fact than not only AMD use a more efficient process but also MTL idle power being higher once the complete chip is fired.
This is correlated by the MSI Claw review that pointed to around 7W idling when all parts of the CPU are under use but with only the OS as load, in real usage Intel can no more use irrelevant figures to artificialy boost the battery life numbers such as local videoplay with only the two e cores running and the rest of the chip gated off.
For full load the CPU Vray test point to 3% better perf for Hawk Point@15W relatively to MTL@28W, so the figure would be no different than in the battery life slide, that is, roughly 45-50% better battery life at full load and at about same perf.