Finally got ot play with the X-T4 last night after leaving it in the box all day whilst I got my work done.
First impressions are, theres alot of menus different to my X-T2 so getting it to match in terms of controls took me most of the night
In terms of AF performance. It's night and day when compared to the X-T2 so i'm chuffed about that. Also the IBIS for handheld photography is very impressive. Not really tested the video out much as i'm a noob when it comes to that. So will have a play with that tonight after i've watched some videos on how best set it up for video.
The other thing to note is it feels so much chunkier than the X-T2 and alot more solid. Lenses are much tighter to get on and all the dials and nobs have a defined click to them. The AF-on button is nice though I take a little getting used to the placement as I was usuing my command dial as Back button focus on the X-T2.
Being able to use the touch screen to select AF point whilst looking through the viewfinder is very good.
Battery Life, well I pretty much drained the battery last night but I was in the menus all night, and had bluetooth on permenatnetly and it was transferring shots to my phone, so cant comment on real world usage yet. Much bigger battery though, and reminds me of the ones i used to have in my Nikon days
Very impressed so far