Thanks all.
Been watching some YouTube vids this eve and also looked at that comparison site.
I didn't realise the X100 is pretty much the same as the A6400 (minus lens) so as mentioned, other than in a jacket it's not really a pocketable option...
I like the look of the GRiii, but it's not got a tilting screen (appreciate I didn't mention this as a need but realising it hasn't got it has made me think I do want it).
I've had an RX100V and traded that in for the A6400 because I wanted something less "point and shoot" feeling so I do wonder if I'd feel the same about it too...
I appreciate I'm probably setting myself up with an impossible task here and think I may have to change my priorities. Maybe I need to accept less pocketable (but not SLR size)...
Just saw a vid of the XT30 which seems to offer a lot of the X100 features too; but with the freedom of different lenses. I could get a 27mm pancake and then go longer if I decided I wanted to later...