RAW images average 105MB each, and JPEG's are limited to previews. You'll need to have a decent computer and fast SD cards, but the payoff is 16-bit RAW "3FR" files with more tonal values than most DSLRs. Hasselblad claims a stellar 14-stops of dynamic range.
One thing I didn't expect was running out of space on the (skimpy) 16GB card that Hasselblad supplied with the demo unit -- it can only hold about 150 of those crazy large images. I found myself deleting photos while shooting like it was 2007, but it did force me to be more choosy about shots.
Low-light capability is excellent, despite what seems like a fairly limited maximum ISO (100-25,600). Hasselblad must have been conservative with those figures, because the top one or two settings are still usable, in my opinion. At anything up to about 3200 ISO, noise was not an issue.
The contrast-detection autofocus is reasonably fast and accurate, though nothing like systems from Sony or Canon. It can fail in low-light situations and is not great at tracking fast-moving subjects, so this is not a sports camera. On the plus side, you can select numerous points using the touchscreen, making it easy to control focus. The auto white balance worked well, whether indoors or out.
I deliberately shot from dusk until dark, both to test the X1D's low-light capability and because that's the best time to shoot, in my opinion. I was soon confidently snapping scenes with both bright lights and dark shadows, knowing that the RAW images had the latitude to deal with it. I was particularly impressed how it handled a shot of Paris' brightly-lit Pantheon, with tourists in the much darker foreground.
I did take some video, and unfortunately, the X1D can only shoot at 1080p/25fps. However, at least it has microphone and headphone inputs, unlike most mirrorless cameras (Sony's A7 models being a notable exception). You can't compare the video quality to, say, a 4K GH5 or Sony A7S II, but the larger sensor does give the footage an interesting look. For instance, at f/3.5, people in the foreground were pin sharp while the background was lightly blurred, creating a mild tilt-shift look.
In the end, I found that the X1D has fewer tradeoffs than possibly any other medium-format camera. Still, why get it instead of more capable full-frame models like the Sony A7R II or Canon 5Ds? The payoff is in the images. With shots I originally thought were too dark, I was able to fully recover shadow details. Over-exposed shots can also be pulled back with details that you thought were blown out (see the images at the end of the gallery, above).
The relatively high resolution makes it possible to crop images down to a quarter of what I shot and still blow them up to poster sizes. Colors and skin tones render accurately right out of the camera and require little, if any, tweaking. The transitions between tones and colors are gentle and natural. In short, the images are stellar right out of the camera, and skilled art, fashion and landscape shooters can get even more out of them in post-production.
Neither you nor I will likely buy this camera, so why look at it? It's simply an interesting, groundbreaking product with features that may wind up in more affordable consumer cameras. Thanks to smartphones, photography is evolving at the fastest rate in its 180-year history, and bleeding-edge models like the X1D can give us clues as to what's next.