Yes. The Steelsring adapter is also great, but they haven't updated the firmware in a while and there are occasional fuck-ups with it - like the Canon 40/2.8 in photo mode on my 100 II kept going to minimum focus and just staying there (if I turned on autofocus, manual focus worked fine). Worked fine in video mode, though.
I should see if they ever updated the firmware on the Techart. I have one around here somewhere and I stopped using it when other adapters got PD support and it didn't. Maybe they finally fixed that.
Any time you're curious about whether a given lens will cover the sensor on a GFX, btw, there's a community google spreadsheet which is pretty comprehensive.
https://docs.google.com/spreadsheets/d/1uxvvpxJ9QVFFyh0pW2rs9KBmUW9vlh-d-VnbcLDCTn8/edit?gid=0#gid=0
I was just looking at it again and realized that the FD 20mm f/2.8 actually covers the full sensor. Now I have to check if I actually have that one (I think I do?)... could be a fun look on the GFX.
But if you want a 24mm EF lens that covers, I think your only option will be one of the PC/TS lenses. They have huge image circles. Won't be an f/1.4, though.