Based on these specs from Olympus' site you get a decent bit rate of 202mbps in 60p but only in 1280x720. FHD 60p gets 52mbps:
"[MOV]
4096 x 2160 (C4K) / 24p / IPB (approx. 237 Mbps)
3840 x 2160 (4K) / 30p, 25p, 24p / IPB (approx. 102 Mbps)
1920x1080 (FHD) / 30p, 25p, 24p / ALL-I (A-I), IPB (SF, F, N)
1920x1080 (FHD) / 60p, 50p / IPB (SF, F, N)
1280x720(HD) / 60p, 50p, 30p, 25p, 24p / ALL-I (A-I), IPB (SF, F, N)
60p: 59.94 fps, 50p: 50.00 fps, 30p : 29.97 fps, 25p : 25.00 fps, 24p: 23.98 fps, C4K 24.00 fps
FHD ALL-I (A-I: ALL-Intra / approx. 202 Mbps), FHD IPB (SF: SuperFine / approx. 52 Mbps, F: Fine / approx. 30 Mbps, N: Normal / approx. 18 Mbps)
HD ALL-I (A-I: ALL-Intra / approx. 102 Mbps), HD IPB(SF : SuperFine / approx.26Mbps, F:Fine / approx.14Mbps, N : Normal / approx.10Mbps)"