I was at the NYC Foto Works last week and Hassy was a sponsor. The Hassy mirrorless camera was there to test out and I was less then impressed.
The files are very nice, and the ergonomics and how the camera feels in your hand is wonderful. However, the operation of the camera is not so great.
Overall, I dont understand the desire for EVFs, and find them deficient on every camera I tested. There is a delay that will really effect you ability to capture the moment. If you are a hobbyist or always shoot from a tripod, sure, it is not too bad. But if you shoot handheld, and especially if your livelihood depends on getting the "shot," EVF just don't cut it. This is especially the case when you are moving fast and changing your composition on the fly.
On top of that, the autofocus missed about half the time. Sure, it was close, and may not matter to a hobbyist since it was so close, but when you need the focus on her eyes and instead it appears on her nose, that's a problem, especially when the project is going to print.
On top of that, the manual focus is kind of weird. As soon as you adjust the focus manually, the EVF zooms to 100% at the center of frame. This does help ensure you nail focus, but then you loose your frame, and there is a delay on the EVF going back to full frame after you finish focusing. In that short amount of time, you will probably loose focus due to you or your subject moving anyway.
Everyone else there had the same feelings, especially those that shoot people, regardless of genre. (NYC Foto Works is a pay for play portfolio review for professionals only, and they vet everyones portfolio before allowing them to participate, so the opinions of those who attend are pretty reflective of the higher end professional market.)
With this being said, they also had the H system to test out. That camera is very nice and works flawlessly, especially when using TrueFocus.