I have the chance to try the OM-D today and it is great in EVF refreshing rate. I panned the camera and found images transient very smoothly and seems even better than the NEX7. HOPE FUJIFILM can upgrade this in new firmware if it is possible. At the moment, I hate while I love the x-pro1.
I own the xpro1 for three weeks and is totally agreed with dpreview about all the flaws reported in it's First Impressions Article. In which the low resolution, low contrast and low refreshing rate of the EVF are most annoying. Manual focusing is nearly impossible given the provided diopter is correct. However, it is not.