All the videos I've seen Dolphin running on S820 + ES 3.2 aren't so impressive, it's like it doesn't utilize ES 3.2 which is unlikely, but it's hard to explain why S820 + ES 3.2 looks worse than A57 + ES 3.2.
Wind Waker on SD808 + ES 3.2 no overclock: https://youtu.be/3sVwxiHpZUg
Note 7 (SD820): https://youtu.be/uGQFObV88ug
P.S. There's a weird thing happening on SD820 devices and on Exynos 8890 (you could notice this on Note 7 video), it's minimising trick. For some reason when you minimize Dolphin you get a short performance boost for a few seconds, it's pushing bigger cores to a maximum on 820/8890. Probably some sort of DVFS or power management kernel settings, or how the system sees Dolphin. This could be a reason why on SD820 you get Dolphin slower than on S808/810
Wind Waker on SD808 + ES 3.2 no overclock: https://youtu.be/3sVwxiHpZUg
Note 7 (SD820): https://youtu.be/uGQFObV88ug
P.S. There's a weird thing happening on SD820 devices and on Exynos 8890 (you could notice this on Note 7 video), it's minimising trick. For some reason when you minimize Dolphin you get a short performance boost for a few seconds, it's pushing bigger cores to a maximum on 820/8890. Probably some sort of DVFS or power management kernel settings, or how the system sees Dolphin. This could be a reason why on SD820 you get Dolphin slower than on S808/810