Update:

> Figure for Swift substantiated and figures for Cortex-A53 and Cortex-A57 added

New list of DMIPS per MHz and core figures (added Cortex-A12 and specified different Krait types):

ARM Cortex-A7: 1.9
ARM Cortex-A8: 2.0
Qualcomm Scorpion: 2.1
ARM Cortex-A53: 2.3
Marvell Sheeva PJ4: 2.4
ARM Cortex-A9: 2.5
Marvell Sheeva PJ4B: 2.6
ARM Cortex-A12: 3.0
Qualcomm Krait 200: 3.1
Qualcomm Krait: 3.3
Qualcomm Krait 300/400: 3.4
Qualcomm Krait 450: 3.5
Broadcom Brahma15: 3.5 (unsure whether or not this core is just ARM Cortex-A15)
Apple Swift: 3.5
ARM Cortex-A15: 3.5
ARM Cortex-A57: 4.1...4.8 (depending on implementation)

Does anybody have DMIPS figures for the Apple Cyclone or the Applied Micro X-Gene?