Thanks folks for your advice.
Twist, I'm considering the the D750 and on paper it's at the top of my list, due to the available lenses for it, but the Sony is appealing as it will be similiar in size to the XT which is jacket pocketable???.. As you probably know I had Nikon before changing to Fuji for the lightness, so I am familiar with the system. What I was hoping to do is confuse the wife and buy another camera (D750) and keep the XT for going out. Looking at our finances I cant do this at present. My secret plan was to buy the D750 for home use and the XT for going out.
Currently I have a camera which basically is not suitable for me. I'm home allday and the little enjoyment I have is trying to catch the little birds that frequent our garden, due to my disabilities Im struggling with my Tokina 300mm f4 lens even with a tripod, it's a heavy lens at 1.4kgs. I also believe that due to some movement between adapter and lens it's not helping things. I don't want go and spend £80 on a Novoflex adapter and still struggle.
My other thinking is, will the D750 or A7 give me better cropability over the Fuji as their FF cameras and more MP?? You have had both what's your thought on this? Could I even get away with a 300mm lens on FF ????
I have an offer on my XT bundle but ideally I would like to try the cameras out, the only place which would probably stock them is Camera Center or John Lewis Cardiff, I haven't looked into this yet. I cant see the Sony Centre Swansea or Currys stocking them based on past experience. Also, I wouldn't buy the Sony without trying there lens adpater, who would stock one to try out and with an A mount lens, this maybe hard to try???
So where Im at. I think Nikon have more lens availability but its a bigger camera in size, is the Sony going to be similiar to the Fuji in size which I like. Decisions, descisions!
Things would be a lot easier if I had small hands, I would use M4/3, But at six foot tall and 18 stone I have hands like shovels.