If I maaaay....
So, first off - I've just downloaded the raw set that's posted in the pack and there is one immediate issue, in that the ICC Profile is blank for some reason (no idea why it's that way on the version that's up there).
If you go to the "Base Characteristics" panel of the EIP, you'll see a blank ICC profile and "No Value" under Curve. Switching this to "Phase One IQ4 150MP > Outdoor Daylight", to begin with makes a huge difference to the image in general, even if applying a simple "Auto" Curve to go with that. I have no idea why it's fallen off of the files they've put to download (but I've just mentioned it to the guys now).
Then we come to the sharpness issue. In reality, the focus point is bang on - and we can see that for verification by turning on the focus mask on the image.
The slight softness out towards the edges on the 40-80 Blue Ring actually surprised me at the time (and the tech I was shooting with), and is something that may need a little more work in lens calibration perhaps - but at f/11 with diffraction correction turned on in Capture One it sharpens up just fine for now. In terms of the final image, more than happy to share the 850MB TIF for people to play with too.
As someone's alluded to here, shooting "secret products" comes with a whole bunch of challenges when thinking about pre-production functionality (and sometimes lack of), along with the need to experiment as we go with extremely limited time. That said, there were a series of 5 images shot across the city, which I'm happy to provide flattened versions of for those who want a look at the others too. In all honesty, the 150 back delivers great images, and there are other examples from that same shoot which show this off perhaps to a better extent
Anyway, hope that helps (at little, at least!).
PS...
LOL at the "pseudo medium format" line in that blog post. Back in my day, we called 645 Pseudo MF! #getoffmylawn
I quite agree - but nobody's quite managed to get even a true 645-sized sensor out of Sony yet...!