I had PMC PB1is and now have Wilson W/P 5.1. I was mostly happy with the PMCs; just was time for a little change.
I found that these speakers are actually more similar than different.
The Wilsons have a little more acoustic space/depth, and the PMCs sounded a little more accurate top to bottom, with leaner bass. Great midrange on both.
Disclaimer - I'm using MIT Matrix cables on the Wilsons which seem like a great match. The PMCs were less cable dependent.