Originally posted by Jonathan Mac I think Fuji will take a fair few of potential Pentax 645Z customers due largely to price and size, but even if I had the cash I wouldn't pre-order, I'd prefer to wait and see how it performs.
Regarding jpeg output, the Fuji X cameras do remarkably well. I almost never use un-edited jpegs from my Pentax SLRs as there's so often something wrong - colour balance or exposure. That's much less common with my X-M1 because a mirrorless "sees" the exposure and colour balance much more accurately than an SLR. I often use SOOC jpegs from the Fuji.
It would be hard to tell, wouldn't it? The medium format market as a whole is tiny and folks who shoot medium format are looking for ultimate image quality, not necessarily the fastest auto focus or frame rates. The interesting thing to me is that Fuji is making a camera that matches the specs of Pentax's three year old camera, while (hopefully) Pentax is working on something else to replace the Z.
In the end, I doubt many will switch/buy in until Fuifilm's lens line up is a little more complete. I also wonder what Pentax is working on. The 645Z was announced in April of 2014 meaning that it is due for a refresh some time this year. My guess is that they release a full frame medium format camera, while keeping the 645z around and dropping the price on it a little. 28mm on a full frame medium format sensor would be pretty sweet.
Size is probably the biggest thing in the GFX's favor, but once you include some glass, neither one of these cameras will fit into a small bag easily.
With regard to shooting SOOC jpegs, I just don't understand why you would take the time and effort to shoot with medium format and then pitch the dynamic range and shadow detail out the window by shooting jpegs. It feels like medium format shooters shoot a lot of landscape and studio shots. For studio shots, it probably isn't a big deal, but for landscape, there is no way that you would want to shoot jpeg, even if color balance and exposure are just perfect. It just feels like the reasons to shoot medium format are for (1) better dynamic range and (2) better detail (with the ability to print/view larger without softening of your image).