The Fujifilm X-T4 represents a pretty big step up over the Fujifilm X-H1 and even the X-T3 until it receives a firmware update with some of the features. Above you can see that most Fujifilm lenses benefit quite a bit from the IBIS of the Fujifilm X-T4 without adding digital stabilization to the mix, which is impressive.
Below you can see how much battery performance has improved in the X-T4 along with what you can expect from the various performance modes that the X-T4 offers. I think my camera will largely remain in boost FPS mode with the read LCD screen turned towards the camera to prevent chimping like the X-Pro3. The reversible screen is actually a big draw for me because of the battery life advantage and I have missed it since my Panasonic GH2.
Further, at this time, the only camera that can match the video recording capabilities of the Fujifilm X-T4 is the Panasonic GH5 and if you want low light performance the GH5S, but that camera does not have IBIS. Fujifilm keeps making progress towards becoming the ultimate hybrid camera and Sony is not keeping up.
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Fujifilm X-T4 Preorder: B&H Photo / Amazon / Adorama
VG-XT4 Vertical Battery Grip: B&H Photo / Amazon / Adorama
NP-W235 Battery: B&H Photo / Amazon / Adorama