Yesterday I was chatting with a photographer I know who teaches at the Dawson Institute of Photography here in Montreal. I hadn't seen him in a while, and we got to discussing flash gear briefly. I told him I had shelved my Canon speedlights to go all Godox, and asked if he was familiar with the system. He said "Oh yeah - all my students use them. Don't you have issues with TTL?
We didn't have time to get into details, but the simple fact that "Don't you have issues with TTL?" were the first words out of his mouth confirmed for me that my own Godox / TTL experience likely isn't an anomaly. Has there been a thread here (or anywhere) that discusses the relative TTL performance of the X1 system with Canon 5DIII and 5DIV bodies? I know eventually I'll have to do some systematic testing of my own, but I'm interested in collecting any info others may have.
With the 5DIII, when shooting events with an off-camera AD200 triggered by an on-camera V860IIC, when using E-TTL I find I usually have -1/3 or -2/3 FEC dialed in on the camera.
With the 5DIV it seems to need more like -2EV. I confess I haven't done a lot of shooting in this configuration, partly because walking around with -2EV on the camera doesn't "feel" like a good idea. I guess I worry that if I needed to switch to a different flash or configuration suddenly, I don't want the One More Thing of remembering to put the FEC back to normal. (Also, at -2EV you don't have much wiggle room left on the left of that dial)
So for now I'm tending to just avoid the issue by shooting the 5DIV available light and using the 5DIII for flash. If anyone here using both these bodies with off-camera Godoxery in TTL, I'd love to hear your experiences.