I have read the reviews, but have not done hands-on for two simple reasons. I am looking for a small digital that has external controls (e.g. for shutter speed, f-stop, compensation...), so the Sony didn't make the short list... the other reason is a bit more personal...
Sony, as far as I know from my previous checking, only sell their small digital cameras with Japanese language interface here in Japan... no English, German, French, etc. etc. If I want English menus I understand that I would have to buy an import or gray market camera, both options would not come with a warranty.
The specifications of the RX100 IV are similar to the LX100 at about 175% the price or about 150 USD less than the X100T... with the positive reviews and price, it's an attractive package...
To be honest the menu language is actually just an inconvenience, the lack of external controls is a show stopper for me.
Casey