Started designing the GFX50R after the GFX50S launched
Design is a merger of X and GFX along with film inspiration
Fujifilm GFX 50S was really meant for professional photographers, but lots of people used it for things beyond what it was designed for.
Medium format photographers wanted better performance than full frame
Both the Fujifilm GFX50S and 50R AF at the same speed.
GFX50R has faster EVF response than the GFX50S for now but might improve on GFX50S in a future firmware update.
Originally were going to make a hybrid EVF, but abandoned it due to weight concerns, plus parallaxing would be worse.
The back of the GFX50S was big because they were still struggling with the design and batteries.
The Fujifilm GFX50R was designed 10 times with plastic models to get it right.
The Fujifilm GFX50R is very well sealed for weather may be more than the GFX50S
Command dial is better for changing ISO when doing street photography
The GFX 50R is now available for pre-order (shipping starts on November 29, 2018) and you can still get up to $1000 off when purchasing a camera + lens bundle at selected retailers - see details at Adorama | B&H | Amazon | WEX (UK) | Park Camera (UK)| Calumet.de.