The Phase 150mm is one of the best lenses I've tested on any platform. I would review/double-check your method of testing or ask your dealer to try another copy of the lens (maybe that one was e.g. dropped at some point).
Well, as advised, i reviewed and double-checked, and from what i can see, i still think there is an issue, but possibly with the DF body more than the 150mm lens. It seems, that the new Phase 55 and 80mm LS lenses are better than the older Hasselblad equivalents, as one would hope / expect, most notably in terms of CA... but the 150 mm tells a different story.
As before, my disclaimer is that i am not particularly technical. I keep things simple - cameras on tripods, 2 second delay, all the usual common sense for working with high-end equipment, and I judge with my eyes, and in this case the eyes of my dealer too, as they'd quite like me to go on and buy the kit that i tested! Admittedly I am kind of fussy, especially when things are very expensive... and for me seeing is preferable to believing.
So, back to the new 150. At the same aperture and shutter speed combinations, the Phase lens manages to out-perfom (apparent detail / sharpness) the H lens at F5.6, and perhaps more importantly at 1/160 sec. Stopping down to F8 / 11 / 16, with with correspondingly slower shutter speeds of 1/80, 1/40, 1/20th, and the tables turn: the Hasselblad lens is noticeably crisper. (In terms of CA, the phase lens is always better from what i have seen to date).
Does the DF suffer from the shakes?
Would it show on a P45 (i am on a P65)?
Anyone else notice softer images below 1/80th second?
And FWIW... the same story is revealed in LR 2.6 / LR3 // C1 Pro 5. whatever it is now... all show the exact same issues.
I realise that i may be mistaken... which is why i asked the original question.
Now back to waiting to hear something / anything from Phase about how and when this issue will be resolved, if it is an issue (?), but in the mean time I am still happily awe-struck by the P65+, and it is still stuck to the back of my trusty old H1.
Back to work...