Getting increased power efficiency from the A15 design remains just than, an assumption. The ARM camp is learning first hand that power efficiency doesn't scale as they try to chase Intel in the performance category. Besides, Intel's Medfield has already been surpassed by Clovertrail that shows the Intel K900 matching and even exceeding Samsung Galaxy quad-core's.
Why do you think your benchmark scores failed to show the performance of the razor i. The benchmarks that you quote showed that the razor m had a performance advantage over the razor i but when the phones were compared by individuals, they found that the razor i was slightly faster and lasted no less than a 18 percent longer in battery life.