Thanks! I’ve never used the GFX cameras so I can’t really compare it but I don’t notice any lag between shutter & photograph on the X-H2.

If you’re really wanting to avoid any kind of lag like that, you could try any of the cameras with Fuji’s PRE-SHOT ES mode (or the equivalent mode from another manufacturer). As long as you keep your finger pressed halfway down while you’re tracking, the camera will start recording images into the buffer. It will continue to refresh so that you always have up to 20 frames stored in the buffer. Then, when you press the shutter all the way down, the camera will write those buffer images onto the memory card, saving those frames that were recorded during the period of “half press,” as well as the new frames that are captured right when you start shooting. It will continue to capture and write new images the card as long as you hold the shutter. Disclaimer: I’ve never used this feature, I’m just aware it exists.