Got ahold on an M7G the other day. Tested so far with BBSE and Samsung, PSC will follow.
reference BBSE results on Z87 (Impact)
CL7 (tWCL8):
CL8 (tWCL6):

same CPU+kit on Z97 (Gene)
CL7 (tWCL8):
CL8 (tWCL6):

Overall, the board is within 0.02V of its predecessor. I was able to push the kit for 1350 8-11-7 and 1360 8-12-7 which wasn't possible on Z87, but getting every result on the list took more attempts due to worse compatibility.
reference Samsung results on Z87 (Impact)


same CPU+kit on Z97 (Gene)


Overall, the kit seems to need 0.01-0.02V less on comparison to Z87. Using the IC optimizer BIOS option I was able to run 1T, which wasn't possible before. Running 1T might have revealed the tRCD weakness of my kit (1466 x-12-x needs too much voltage) hence the 1466c9 split into 2T and 1T.
Note that the board overvolts Vmem by 0.025-0.035V compared to the value set in the BIOS.