There's limited choice, but Fuji provides one of those choices
(http://www.fujifilm.com/products/digital_cameras/gfx/index.h...).
Well .. true, but mostly because that is a HUGE size for a digital sensor. The only "medium" format digital I'm familiar with is the pentax 645, it is smaller than that old film and yet still 50MP (!). The tech will only improve.
I wouldn't hold your breath for any sensor of the size of the old film you're talking about. There's a certain threshold above which there are diminishing returns. I suppose there are some cinema sensors being made at 70mm but they are very niche and ruinously expensive. My money might be on the 645 size becoming standard, and it's a reasonable one.
> not even real medium format
To be fair there is no "real" medium format. It basically means "bigger than 35mm".
as i mentioned there is a clear market for actual digital medium format using digital backs you can plug on old hasselblad or equivalent twin lenses models. So this is not fiction or something. And sensor size is not about pixels, you get a very different depth of field with medium and large format. thats is why we still use them.
The 645z and x1d are delivering the medium format DoF right now. Things can be improved upon, sure, but insisting on a certain sensor size is misguided. That size was necessary simply because of the limitations of film chemistry. Remove this limitation and the sensor size becomes less relevant.
https://en.wikipedia.org/wiki/Depth_of_field#Relationship_of...