Update:

> this is the new revised list: [...]

New list of DMIPS per MHz and core figures for ARM cores, taking the Swift core of the Apple A6 SoC into account (only with an estimation unfortunately):

ARM Cortex-A7: 1.9
ARM Cortex-A8: 2.0
Qualcomm Scorpion: 2.1
Marvell Sheeva PJ4: 2.4
ARM Cortex-A9: 2.5
Marvell Sheeva PJ4B: 2.6
Qualcomm Krait: 3.3
Apple Swift: 3.3...3.5 (estimated)
ARM Cortex-A15: 3.5