would you say this GFX camera is a "replacement" to the 50R? or the 50R will have it's own upgrade or 100R? Though I wonder if they will keep the 50mp for better low light while 50mp is good enough and hopefully benefit with larger pixels, or even do video. From what I've read around sadly there's no new 50mp so its less worth while.
If it has ibis, I would say its a replacement because it increases utility and make it a much better day to day camera. Now a days 50mp is not longer impressive with some many camera offering that option.
