Imaging Resource just posted their 45mm PRO lens review conclusion:
Overall, the Olympus 45mm f/1.2 Pro is yet another stunning lens for Micro Four Thirds photographers. Just like the two other f/1.2 Zuiko Pro primes, this longer portrait-centric version combines tack-sharp imaging performance with rugged, durable build quality. Now, is the $1200 price justified? Hard to say, as the less expensive alternatives are quite impressive on their own without the big hit to the checking account. But, if you’re a serious photographer or a professional and in need of one of the best portrait prime lenses for Micro Four Thirds, the Olympus 45mm f/1.2 Pro is that lens.